Random classes for each post.

plugin.php

<?php
/**
 * Plugin Name: Random classes for each post
 * Plugin URI: http://jeremy.hu
 * Description: Random classes for each post
 * Version: 1.0
 * Author: Jeremy Herve
 * Author URI: http://jeremy.hu
 * Text Domain: jeherve
 * Domain Path: /languages/
 * License: GPL2
 */

/**
 * Add a random class to each post
 *
 * Class will use a random number between 1 and 5
 * We'll then use that class to use different fonts for our post titles.
 */
function jeherve_rand_num_post_class( $classes ) {
	$classes[] = 'rand_' . mt_rand( 1, 5 );
	return $classes;
}
add_filter( 'post_class', 'jeherve_rand_num_post_class' );

/**
 * You can then use those classes in your theme stylesheet, to apply different styles to each post.
 * In the example below, I change the post title's font randomly.
 *
 * .home .rand_1 .entry-header h1.entry-title {
 * 	   font-family: Lora, Georgia, serif;
 * 	   font-weight: 700;
 * }
 * 
 * .home .rand_2 .entry-header h1.entry-title {
 * 	   font-family: Monoton, Georgia, serif;
 * 	   font-weight: 400;
 * }
 * 
 * .home .rand_3 .entry-header h1.entry-title {
 * 	   font-family: Medula One, Georgia, serif;
 * 	   font-weight: 400;
 * 	   font-size: 7rem;
 * }
 * 
 * .home .rand_4 .entry-header h1.entry-title {
 * 	   font-family: Pacifico, Georgia, serif;
 * 	   font-weight: 400;
 * }
 * 
 * .home .rand_5 .entry-header h1.entry-title {
 * 	   font-family: Abril Fatface, Georgia, serif;
 * 	   font-weight: 400;
 * }
 */