This floating bookshelf is perfect for an ultra-minimal look. The Conceal bookshelf from Umbra mounts to the wall and becomes invisible behind a stack of books, giving the books the appearance of floating in mid-air.
DIY Cardboard furniture That doesn't look like it's made from cardboard! We've had some great posts on cardboard furniture you can buy that doesn't LOOK like cardboard, but most DIY options resemble the brown recyclable stuff.
L'idée déco du samedi : des livres suspendus - Floriane Lemarié
Some pretty awesome book shelves. I personally want floor to ceiling shelves covering at least two walls in my spare bedroom. until I upgrade from condo to a house with a full-blown library / reading-n-nook room :D