This bookshelf pays tribute to the origins of the book. The tree-shaped rack has multi-purpose usage, as you can see.
This bookshelf has a adjustable bookend so your books will always stay upright no matter where they are on the shelf.
This bookshelf looks like it can be easily replicated using leftovers of a woodwork project. Love the homemade DIY feel to it. The creator of this shelf won an award for her creativity.
ADDED ON 4 JULY:
How about this 2-D rack? Very cute sticker wallpaper. Available in other designs, such as a skyline view or the Eiffel Tower!
Another version of the tree-inspired bookshelf. Good for books or decorative items. Or books as said decorative items.
All bookshelves spotted at my favourite interior decoration website, Freshome (see sidebar for link).