BP Mag is a premium BuddyPress Theme Framework  for Building your very own special social network. It has the unlimited potential to be extend upto any level. The main goal of bp-mag was to provide a basic framework and allow to extend it using child themes with very few lines of code. And it does. With a few lines of code magic, you can manipulate the whole layout and build almost any sort of layout on it.  Further, It uses the current features available in wp 3.0/3.1(trunk) and leverages the core of BuddyPress.

Please read more here http://buddydev.com/themes/bp-mag/