Cos you can’t 
. There’s no feature to change the blog avatar.
That cant be possible, that doesn’t make any sense?
Haha, yea. Not sure why not either.
just remove them in your theme if you don’t like them. Or – you could use the author’s avatar instead.
Gotta agree with Shnooka30 on this one. Because blogs may be identified by topic rather than author, it would only make sense that a custom avatar could be assigned to the blog to override the blog creator or default avatar.
This is already planned on the Roadmap for version 1.4
How exactly would you use the author avatar instead? Because that would actually work perfectly for my setup. Thanks.
If you want to show the avatar on each post then you would get the avatar for $post->post_author. It would probably be a very minor tweak to the theme.
i should say this is probably the worse limitation of buddypress.
Also quite surprised 😯
Would be nice to be able to provide graphical links to blogs from the homepage. (somewhat hidden widget request 
One year 8 months later; v. 1.5. has just come out, and STILL no possibility of editing blog avatars; and it makes even LESS sense today than way back when. It just CAN´T be that hard!
BuddyPress is a volunteer project; other than the lead developer who has a portion of his time dedicated to developing and managing BuddyPress, no one else is paid to code it. The project heavily relies on the contributions of others.
That being said, it is not too hard to code a blog avatars plugin for BuddyPress, someone just needs to find the time out of their schedule to code it. Be it for a client or for free.
