I think this would be a nice mod. Just another way to access to the profile.
Do you mean for posts made inside topics?
This wouldn't require a mod, it would be just a simple template change.
Themes/<theme_name>/Display.template.php:
echo '
<div style="overflow: auto; width: 100%;">', $message['member']['avatar']['image'], '</div><br />';
echo '
<div style="overflow: auto; width: 100%;"><a href="', $message['member']['href'], '">', $message['member']['avatar']['image'], '</a></div><br />';
Your smart I will try. :P
Aka I tried it works fine but when I click it on the default SMF core it shows a scrollbox. Is there a code to get rid of that?