BuddyPress.org

What is available lets the individual bloggers ( who are part of a buddypress-wmu site) choose individual themes for their respective blogs or for their admin areas.

However, if they want to see their buddypress site from a set of exclusive-buddypress themes there seems no way they can do that or the site super admin can allow them to do that.

I read docs as much as I could and searched as much as I can but apparently there seems to be no solution unless someone provides some way around.