DIY Instant Closet from Chairs
This really is incredibly clever. The chairs are a simple wooden folding variety and are not permanently affixed to the wall. Yet when opened they stabilize, hold boxes of loose articles and are the perfect width from the wall to hang even the most bulky of garments.
The entire article Re-Thinking Furniture: Innovative Design Explorations by Yi Cong Lu from Core77 is a good read and full of clever designs.