Blogs loop - display group avatar

How would I get the assosiated group avatar to display rather/in-place of the blogs author's avatar in the blogs index?

Im using the group blog plugin, so each group can have a associated blog and Iv'e restricted members to only be able to create one group. Only groups will have blogs, normal members cant create blogs..

So I think it would be something like 'is admin of group>get group avatar' but Iv'e tried playing around and cant find the right solution. @Tammie, any suggestions?

Here's the blogs loop section:

<div class="item-avatar">
"><?php bp_blog_avatar('type=thumb') ?>
</div>