Again, this is an extremely simple edit which requires maybe one file upload and one template (or if you have style selection between normal and legacy, two) to be edited.

Find:


<if condition="$show['avatar']"><td class="alt2"><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="$post[avatarurl]" $post[avwidth] $post[avheight] alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a></td></if>

Replace with (noted bolded):

<if condition="$show['avatar']"><td class="alt2"><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="images/avatars/ 1_face.jpg" $post[avwidth] $post[avheight] alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a></td></if>

Replace the bolded with the image address. You can also wrap the code in conditionals and such likes for different images per usergroup or something. I did this on my own site for one of about four April Fools Day jokes, and it was a minor annoyance/novelty.

Few Example Images:

[see attachments]

Attached are the two images I used personally.