We've used a similar corner shelving unit to create space in a small 7 by 9 ft room. It's a great, easy shelving solution for small spaces (although installing it was a bit tricky as the walls weren't plumb.
Bold Book Shelving Branches Naturally Along Interior Walls - Want to bring a bit of nature inside, but not have to worry about watering the plants or picking up after the leaves? Well, this branched, tree-shaped bookcase might be just the thing.
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.