diff --git a/templates/themes/semirand/info.php b/templates/themes/semirand/info.php
new file mode 100644
index 00000000..255935c1
--- /dev/null
+++ b/templates/themes/semirand/info.php
@@ -0,0 +1,70 @@
+<?php
+
+	// Basic theme properties
+	$theme = array(
+		'name'        => 'Mixed All/Random Overboard',
+		// Description (you can use Tinyboard markup here)
+		'description' => 'Board with threads from all boards with most recently bumped and random ones intermixed',
+		'version'     => 'v0.1',
+		// Unique function name for building and installing whatever's necessary
+		'build_function'   => 'semirand_build',
+		'install_callback' => 'semirand_install',
+	);
+
+	// Theme configuration
+	$theme['config'] = array(
+		array(
+			'title'   => 'Board name',
+			'name'    => 'title',
+			'type'    => 'text',
+			'default' => 'Semirandom',
+		),
+		array(
+			'title'   => 'Board URI',
+			'name'    => 'uri',
+			'type'    => 'text',
+			'default' => '.',
+			'comment' => '("mixed", for example)',
+		),
+		array(
+			'title'   => 'Subtitle',
+			'name'    => 'subtitle',
+			'type'    => 'text',
+			'comment' => '(%s = thread limit, for example "%s coolest threads")',
+		),
+		array(
+			'title'   => 'Excluded boards',
+			'name'    => 'exclude',
+			'type'    => 'text',
+			'comment' => '(space seperated)',
+		),
+		array(
+			'title'   => 'Number of threads',
+			'name'    => 'thread_limit',
+			'type'    => 'text',
+			'default' => '15',
+		),
+		array(
+			'title'   => 'Random threads',
+			'name'    => 'random_count',
+			'comment' => '(number of consecutive random threads)',
+			'type'    => 'text',
+			'default' => '1',
+		),
+		array(
+			'title'   => 'Bumped threads',
+			'name'    => 'bumped_count',
+			'comment' => '(number of consecutive recent threads)',
+			'type'    => 'text',
+			'default' => '1',
+		),
+	);
+
+	if (!function_exists('semirand_install')) {
+		function semirand_install($settings) {
+			if (!file_exists($settings['uri'])) {
+				@mkdir($settings['uri'], 0777) or error("Couldn't create {$settings['uri']}. Check permissions.", true);
+			}
+		}
+	}
+
diff --git a/templates/themes/semirand/semirand.js b/templates/themes/semirand/semirand.js
new file mode 100644
index 00000000..c07e8452
--- /dev/null
+++ b/templates/themes/semirand/semirand.js
@@ -0,0 +1,158 @@
+$(document).ready(function() {
+	var cachedPages = [],
+		loading = false,
+		timer = null;
+
+	// Load data from HTML5 localStorage
+	var hiddenBoards = JSON.parse(localStorage.getItem('hiddenboards'));
+
+	var storeHiddenBoards = function() {
+		localStorage.setItem('hiddenboards', JSON.stringify(hiddenBoards));
+	};
+
+	// No board are hidden by default
+	if (!hiddenBoards) {
+		hiddenBoards = {};
+		storeHiddenBoards();
+	}
+
+	// Hide threads from the same board and remember for next time
+	var onHideClick = function(e) {
+		e.preventDefault();
+		var board = $(this).parent().next().data('board'),
+			threads = $('[data-board="'+board+'"]:not([data-cached="yes"])'),
+			btns = threads.prev().find('.threads-toggle'),
+			hrs = btns.next();
+
+		if (hiddenBoards[board]) {
+			threads.show();
+			btns.find('.threads-toggle').html(_('(hide threads from this board)'));
+			hrs.hide();
+		} else {
+			threads.hide();
+			btns.html(_('(show threads from this board)'));
+			hrs.show();
+		}
+
+		hiddenBoards[board] = !hiddenBoards[board];
+		storeHiddenBoards();
+	};
+
+	// Add a hiding link and horizontal separator to each thread
+	var addHideButton = function() {
+		var board  = $(this).next().data('board'),
+			// Create the link and separator
+			button = $('<a href="#" class="unimportant threads-toggle"></a>')
+				.click(onHideClick),
+			myHr   = $('<hr />');
+
+		// Insert them after the board name
+		$(this).append(' ').append(button).append(myHr);
+
+		if (hiddenBoards[board]) {
+			button.html(_('(show threads from this board)'));
+			$(this).next().hide();
+		} else {
+			button.html(_('(hide threads from this board)'));
+			myHr.hide();
+		}
+	};
+
+	$('h2').each(addHideButton);
+
+	var appendThread = function(elem, data) {
+		var boardLink = $('<h2><a href="' + modRoot + data.board + '/">/' +
+							data.board + '/</a></h2>');
+
+		// Push the thread after the currently last one
+		$('div[id*="thread_"]').last()
+			.after(elem.data('board', data.board)
+				   .data('cached', 'no')
+				   .show());
+		// Add the obligatory board link
+		boardLink.insertBefore(elem);
+		// Set up the hiding link
+		addHideButton.call(boardLink);
+		// Trigger an event to let the world know that we have a new thread aboard
+		$(document).trigger('new_post', elem);
+	};
+
+	var attemptLoadNext = function() {
+		if (!ukko_overflow.length) {
+			$('.pages').show().html(_('No more threads to display'));
+			return;
+		}
+
+		var viewHeight = $(window).scrollTop() + $(window).height(),
+			pageHeight = $(document).height();
+		// Keep loading deferred threads as long as we're close to the bottom of the
+		// page and there are threads remaining
+		while(viewHeight + 1000 > pageHeight && !loading && ukko_overflow.length > 0) {
+			// Take the first unloaded post
+			var post = ukko_overflow.shift(),
+				page = modRoot + post.board + '/' + post.page;
+
+			var thread = $('div#thread_' + post.id + '[data-board="' + post.board + '"]');
+			// Check that the thread hasn't been inserted yet
+			if (thread.length && thread.data('cached') !== 'yes') {
+				continue;
+			}
+
+			// Check if we've already downloaded the index page on which this thread
+			// is located
+			if ($.inArray(page, cachedPages) !== -1) {
+				if (thread.length) {
+					appendThread(thread, post);
+				}
+			// Otherwise just load the page and cache its threads
+			} else {
+				// Make sure that no other thread does the job that we're about to do
+				loading = true;
+				$('.pages').show().html(_('Loading…'));
+
+				// Retrieve the page from the server
+				$.get(page, function(data) {
+					cachedPages.push(page);
+
+					// Cache each retrieved thread
+					$(data).find('div[id*="thread_"]').each(function() {
+						var thread_id = $(this).attr('id').replace('thread_', '');
+
+						// Check that this thread hasn't already been loaded somehow
+						if ($('div#thread_' + thread_id + '[data-board="' +
+							  post.board + '"]').length)
+						{
+							return;
+						}
+
+						// Hide the freshly loaded threads somewhere at the top
+						// of the page for now
+						$('form[name="postcontrols"]')
+							.prepend($(this).hide()
+									 .data('cached', 'yes')
+									 .data('data-board', post.board));
+					});
+
+					// Find the current thread in the newly retrieved ones
+					thread = $('div#thread_' + post.id + '[data-board="' +
+							   post.board + '"][data-cached="yes"]');
+
+					if (thread.length) {
+						appendThread(thread, post);
+					}
+
+					// Release the lock
+					loading = false;
+					$('.pages').hide().html('');
+				});
+				break;
+			}
+		}
+
+		clearTimeout(timer);
+		// Check again in one second
+		timer = setTimeout(attemptLoadNext, 1000);
+	};
+
+	attemptLoadNext();
+});
diff --git a/templates/themes/semirand/theme.php b/templates/themes/semirand/theme.php
new file mode 100644
index 00000000..1acecbfb
--- /dev/null
+++ b/templates/themes/semirand/theme.php
@@ -0,0 +1,254 @@
+<?php
+
+	require 'info.php';
+
+	/**
+ 	 * Generate the board's HTML and move it and its JavaScript in place, whence
+	 * it's served
+	 */
+	function semirand_build($action, $settings) {
+		global $config;
+
+		if ($action !== 'all' && $action !== 'post' && $action !== 'post-thread' &&
+			$action !== 'post-delete')
+		{
+			return;
+		}
+
+		if ($config['smart_build']) {
+			file_unlink($settings['uri'] . '/index.html');
+		} else {
+			$semirand = new semirand($settings);
+
+			// Copy the generated board HTML to its place
+			file_write($settings['uri'] . '/index.html', $semirand->build());
+			file_write($settings['uri'] . '/semirand.js',
+				Element('themes/semirand/semirand.js', array()));
+		}
+	}
+
+	/**
+	 * Encapsulation of the theme's internals
+	 */
+	class semirand {
+		private $settings;
+
+		function __construct($settings) {
+			$this->settings = $this->parseSettings($settings);
+		}
+
+		/**
+		 * Parse and validate configuration parameters passed from the UI
+		 */
+		private function parseSettings($settings) {
+			if (!is_numeric($settings['thread_limit']) ||
+				!is_numeric($settings['random_count']) ||
+				!is_numeric($settings['recent_count']))
+			{
+				error('Invalid configuration parameters.', true);
+			}
+
+			$settings['exclude']      = explode(' ', $settings['exclude']);
+			$settings['thread_limit'] = intval($settings['thread_limit']);
+			$settings['random_count'] = intval($settings['random_count']);
+			$settings['recent_count'] = intval($settings['recent_count']);
+
+			if ($settings['thread_limit'] < 1 ||
+				$settings['random_count'] < 1 ||
+				$settings['recent_count'] < 1)
+			{
+				error('Invalid configuration parameters.', true);
+			}
+
+			return $settings;
+		}
+
+		/**
+ 		 * Obtain list of all threads from all non-excluded boards
+		 */
+		private function fetchThreads() {
+			$query   = '';
+			$boards  = listBoards(true);
+
+			foreach ($boards as $b) {
+				if (in_array($b, $this->settings['exclude']))
+					continue;
+				// Threads are those posts that have no parent thread
+				$query .= "SELECT *, '$b' AS `board` FROM ``posts_$b`` " .
+					"WHERE `thread` IS NULL UNION ALL ";
+			}
+
+			$query  = preg_replace('/UNION ALL $/', 'ORDER BY `bump` DESC', $query);
+			$result = query($query) or error(db_error());
+
+			return $result->fetchAll(PDO::FETCH_ASSOC);
+		}
+
+		/**
+		 * Retrieve all replies to a given thread
+		 */
+		private function fetchReplies($board, $thread_id) {
+			$query = prepare("SELECT * FROM ``posts_$board`` WHERE `thread` = :id");
+			$query->bindValue(':id', $thread_id, PDO::PARAM_INT);
+			$query->execute() or error(db_error($query));
+
+			return $query->fetchAll(PDO::FETCH_ASSOC);
+		}
+
+		/**
+		 * Intersperse random threads between those in bump order
+		 */
+		private function shuffleThreads($threads) {
+			$random_count = $this->settings['random_count'];
+			$recent_count = $this->settings['recent_count'];
+			$total        = count($threads);
+
+			// Storage for threads that will be randomly interspersed
+			$shuffled = array();
+
+			// Ratio of bumped / all threads
+			$topRatio = $recent_count / ($recent_count + $random_count);
+			// Shuffle the bottom half of all threads
+			$random   = array_splice($threads, floor($total * $topRatio));
+			shuffle($random);
+
+			// Merge the random and sorted threads into one sequence. The pattern
+			// starts at random threads
+			while (!empty($threads)) {
+				$shuffled = array_merge($shuffled,
+					array_splice($random, 0, $random_count),
+					array_splice($threads, 0, $recent_count));
+			}
+
+			return $shuffled;
+		}
+
+		/**
+		 * Build the HTML of a single thread in the catalog
+		 */
+		private function buildOne($post, $mod = false) {
+			global $config;
+
+			openBoard($post['board']);
+			$thread  = new Thread($post, $mod ? '?/' : $config['root'], $mod);
+			$replies = $this->fetchReplies($post['board'], $post['id']);
+			// Number of replies to a thread that are displayed beneath it
+			$preview_count = $post['sticky'] ? $config['threads_preview_sticky'] :
+				$config['threads_preview'];
+
+			// Chomp the last few replies
+			$disp_replies   = array_splice($replies, 0, $preview_count);
+			$disp_img_count = 0;
+			foreach ($disp_replies as $reply) {
+				if ($reply['files'] !== '')
+					++$disp_img_count;
+
+				// Append the reply to the thread as it's being built
+				$thread->add(new Post($reply, $mod ? '?/' : $config['root'], $mod));
+			}
+
+			// Count the number of omitted image replies
+			$omitted_img_count = count(array_filter($replies, function($p) {
+				return $p['files'] !== '';
+			}));
+
+			// Set the corresponding omitted numbers on the thread
+			if (!empty($replies)) {
+				$thread->omitted = count($replies);
+				$thread->omitted_images = $omitted_img_count;
+			}
+
+			// Board name and link
+			$html  = '<h2><a href="' . $config['root'] . $post['board'] . '/">/' .
+				$post['board'] . '/</a></h2>';
+			// The thread itself
+			$html .= $thread->build(true);
+
+			return $html;
+		}
+
+		/**
+		 * Query the required information and generate the HTML
+		 */
+		public function build($mod = false) {
+			if (!isset($this->settings)) {
+				error('Theme is not configured properly.');
+			}
+
+			global $config;
+
+			$html     = '';
+			$overflow = array();
+
+			// Fetch threads from all boards and chomp the first 'n' posts, depending
+			// on the setting
+			$threads     = $this->shuffleThreads($this->fetchThreads());
+			$total_count = count($threads);
+			// Top threads displayed on load
+			$top_threads = array_splice($threads, 0, $this->settings['thread_limit']);
+			// Number of processed threads by board
+			$counts      = array();
+
+			// Output threads up to the specified limit
+			foreach ($top_threads as $post) {
+				if (array_key_exists($post['board'], $counts)) {
+					++$counts[$post['board']];
+				} else {
+					$counts[$post['board']] = 1;
+				}
+
+				$html .= $this->buildOne($post, $mod);
+			}
+
+			foreach ($threads as $post) {
+				if (array_key_exists($post['board'], $counts)) {
+					++$counts[$post['board']];
+				} else {
+					$counts[$post['board']] = 1;
+				}
+
+				$page       = 'index';
+				$board_page = floor($counts[$post['board']] / $config['threads_per_page']);
+				if ($board_page > 0) {
+					$page = $board_page + 1;
+				}
+				$overflow[] = array(
+					'id'    => $post['id'],
+					'board' => $post['board'],
+					'page'  => $page . '.html'
+				);
+			}
+
+			$html .= '<script>var ukko_overflow = ' . json_encode($overflow) . '</script>';
+			$html .= '<script type="text/javascript" src="/'.$this->settings['uri'].'/semirand.js"></script>';
+
+			return Element('index.html', array(
+				'config'       => $config,
+				'board'        => array(
+					'url'      => $this->settings['uri'],
+					'title'    => $this->settings['title'],
+					'subtitle' => str_replace('%s', $this->settings['thread_limit'],
+						strval(min($this->settings['subtitle'], $total_count))),
+				),
+				'no_post_form' => true,
+				'body'         => $html,
+				'mod'          => $mod,
+				'boardlist'    => createBoardlist($mod),
+			));
+		}
+
+	};
+
+	if (!function_exists('array_column')) {
+		/**
+		 * Pick out values from subarrays by given key
+		 */
+		function array_column($array, $key) {
+			$result = [];
+			foreach ($array as $val) {
+				$result[] = $val[$key];
+			}
+			return $result;
+		}
+	}
+
diff --git a/templates/themes/semirand/thumb.png b/templates/themes/semirand/thumb.png
new file mode 100644
index 00000000..eb616ef7
Binary files /dev/null and b/templates/themes/semirand/thumb.png differ