The Raw Studio is a great furnishings web site that uses sustainable materials to create sculptural seating. Added bonus, if you need the space in your apartment for a dance competition, most of their furniture can be taken down, folded flat, and stuffed under a bed.
The Hive chair is a new take on ceiling mounted furniture. It does seem less hive-like and more cocoon, though, the perfect place to curl up with a book.
The 2pac chairs come completely flat and can be put together with just a mallet, and they're almost foolproof since there's only two different shapes. There's also a different version of the same shapes that makes a three chair-length bench.