so I saw a lot of posts about how to replace the member group title with an image
but :-\ what happens if one of your groups doesn't have an image :P
so for 2.0.15 (sorry can't help with any other versions)
this is only for the default (curve) theme, so you'll need to figure out on an edited theme/different theme
open Display.template.php (theme/default/Display.template.php)
find
// Show the member's primary group (like 'Administrator') if they have one.
if (!empty($message['member']['group']))
echo '
<li class="membergroup">', $message['member']['group'], '</li>';
replace
// Show the member's primary group (like 'Administrator') if they have one.
if (!empty($message['member']['group_stars']))
echo '
<li class="stars">', $message['member']['group_stars'], '</li>';
else
if (!empty($message['member']['group']))
echo '
<li class="membergroup">', $message['member']['group'], '</li>';
then find and remove (to stop it from showing up twice)
echo '
<li class="stars">', $message['member']['group_stars'], '</li>';
if this has been posted, sorry I didn't see it.....