[TheLastSuperman]

That mod does exist however it's for the userinfo background not the actual post message background per say.

You could simply add in more css definitions based on that one then within the template use something along the lines of:

<div class="<vb:if condition="is_member_of($bbuserinfo, 1,2,3)">CLASS FOR THESE GROUPS<vb:else />THE NORMAL CLASS</vb:if>">
Code Code Code
</div>

So basically your wrapping the css definition name within the class="css definition name" in a template conditional to show the background associated with that class IF the user is in one of those groups OTHERWISE it shows the normal way .

Edit: and Basil do us a favor and upload attachments here not on vbulletin.com then posted here as some will help however if they are not logged in to vb.com and here too at the same time then they can't see the image .