Unfortunately, there are no skins available for Joomlaboard, at least not from the two shoes site. In contrast, PHPBB has incredible skins.
What about this...there's a tool to synchronize Joomla and CB, right? So I run PHPBB, which integrates with Joomla, then run the sync tool everyday, that at least means that my users won't have to register once for CB and again for the bulletin board, right?
Of course, they wouldn't have the feature of clicking a user's avatar and going right to their CB profile.
Roger