bbPress.org

Chris the bbpress.org theme willl likely never be available since it’s not a GPL creation, Matt paid employees to have it made.

However there is a WPMimic theme for bbPress which makes it look very close to this since it simulates wordpress.org

For some reason I have the wrong screenshot of it but you can see it in action like this:

http://bbshowcase.org/forums/?bbtheme=WPMimic