I think that it would be a good idea if FSM hosted a limited image hosting gallery to hold all group build badges. They are ridiculously small in size and it would be a fairly easy affair to set up. Just host them all on one page, and users can submit through e-mail or a submission thread.
Reason being, since now all users host their own GB badges, if a particular user goes away, deletes image host accounts, or anything else, then all those others whom were in that GB will have their image not display. This just makes it more universal and stable.