[Karri]

This is how I managed to make it work. I do it so that certain users get a certain color but it translates easily to the whole group getting the color you pick.

Go to your skins css and define something like

.VIP_Group { color:#000000 }

Then go to your postbit template and find

<!-- message -->
<div id="post_message_$post[postid]">$post[message]</div>
<!-- / message -->

and replace with

		<!-- message -->              
<if condition="(in_array($post['usergroupid'],  array('group number goes here')))">
    <span class="VIP_Group"><div id="post_message_$post[postid]">$post[message]</div></span>
<else />
 <div id="post_message_$post[postid]">$post[message]</div>
</if>

		<!-- / message -->

That should do what you are looking for.