Here is a small modification of wolfman, user level mod.
in user/profile.php find
PHP Code:
echo "<tr><td><p>Group</p></td><td><p>".$userrow['can_do'];
and replace to
PHP Code:
echo "<tr><td><p>Group</p></td><td><p><img src=\"themes/".$theme."/pics/group/".$userrow['can_do'].".png\" alt = '".$userrow['can_do']."'>\n";
Create folder "group" in themes/pmbt/pics/ or in every other themes pics folder.
Create pics called (usersclass).png and put it in created "group" folder.