Alcoved Day Beds on opposite sides of the room with shelving along the side and drawers above the head instead of shelves--curtains, hanging pendant light. Each could completely individualize their own little space.
Nook in The Bedroom- Such a pretty idea for a little girls bedroom. Many newer homes have at least one bedroom with a slanted wall. Framing in the bed and using drapes makes this a special feature instead of an eyesore. Feminine and cozy.