[_ck_]

The themes section on WordPress.org is brand new and replaced the defunct one on WordPress.net bbPress.org will eventually get the look and layout that WordPress.org has, it just might take awhile as there is no one to work on it while bbPress is being developed.

A few sites have tried to do the “collections” idea but they have come and gone. I pretty much try to do what you are asking for on http://bbShowcase.org and of course right on this forum are lots of tips and tricks