<?php
$the_query = new WP_Query("showposts=6&cat=1&orderby=rand");
while ( $the_query ->have_posts() ) {$the_query ->the_post(); $i++;
if ($i == 1){echo "<div class=row-fluid>";}
?>
<div class="span4">
Random Post <?php echo $i ; ?>
</div>
<?php
if ($i == 3){echo "</div><div class=row-fluid>";}
if ($i == 6){echo "</div>";$i=0;}
}
wp_reset_postdata();
?>