<?php
$c = 1; //init counter
$bpr = 3; //boxes per row
$wp_query = new WP_Query(array('showposts' => 9, 'orderby'=> 'rand', 'post_type' => array('actors',  'plays', 'schools', 'directors', 'producers', 'singers', 'theatres', 'history', 'technicians')));
while( have_posts() ) : the_post(); ?>


        <div class="post" id="post-<?php the_ID(); ?>">
                <p><?php $post_type = get_post_type_object( get_post_type($post) );
echo $post_type->label ; ?></p>
<a href="<?php the_permalink() ?>" rel="bookmark">
<?php if ( has_post_thumbnail() ) {
the_post_thumbnail('thumbnail');
} else { ?>
<img src="<?php bloginfo('template_directory'); ?>/img/fallback_image.jpg" alt="<?php the_title(); ?>" />
<?php } ?>
</a>
            </div>
<?php
if($c == $bpr) :
?>
<div class="clr"></div>
<?php
$c = 0;
endif;
?>
<?php
        $c++;
    endwhile;
?>
<div class="clr"></div>