An open display
These wall cabinets can be fixed up on the wall wherever you like, so not only can you show off your things in a nice way but you can position the storage to make a playful display too.
Frame your room
Lining up shelves over the tops of the windows, makes use of often unused space as well as frames the window in a nice way. If you need lots of extra storage you could always continue with the shelves framing around the whole room.