[Fastbird]

Here's mine. Like I said before, it's setup for everyone to have the basic background and then for administrators to have the custom one.

You will need to assign a separate CSS too.

<if condition="is_member_of($post, 6)">
<td class="postbit" width="175" style="border: $stylevar[cellspacing]px solid $stylevar [tborder_bgcolor]; border-top: 0px; border-bottom: 0px id="td_post_$post[postid]">
<else />
<td class="postbit3" width="175" style="border: $stylevar[cellspacing]px solid               $stylevar[tborder_bgcolor]; border-top: 0px; border-bottom: 0px"></if>                     <if condition="$show['avatar']">