Also great for kids of age to carry a house key - Bracelet key, no more putting keys in your pocket. Great for jogging and wearing pocketless pants. Dude I'm 14 and I still lose house keys I need this badly.
How cool is the Tree Bookcase by Roberto Corazza? This single-cast plastic bookcase is open on both sides allowing it to be attached to a wall or standing freely, leaving access to the books stored on the "branches" of the tree.