Seems like a really cool idea, might require a lot of painting, and certainly a lot of crates....
Tree Bookshelf, by PatrickW51 [Instructables]
Turn a Cable Spool into a Bookshelf...awesome upcycle idea!
Kentwood Bookshelf | Do It Yourself Home Projects from Ana White
Ladder Bookshelf. That's a neat idea. I would probably need a lot of these because I own a lot of books. [ Wainscotingamerica.com ] #DIY #wainscoting #design
Elephant Buffet: How To Keep From Falling Down A Staircase
Cool Crafts You Can Make for Less than 5 Dollars | Cheap DIY Projects Ideas for Teens, Tweens, Kids and Adults | Floating Bookshelves | http://diyprojectsforteens.com/cheap-diy-ideas-for-teens/
Tutorial and free plans on how to build a DIY rustic bookshelf with crates and reclaimed pallets
Such a cool project! DIY floating bookshelf that is so simple and cheap to make. All 9 steps displayed on site! http://www.ehow.com/how_12340156_dress-up-wall-floating-bookshelf.html?utm_source=pinterest&utm_medium=fanpage&utm_content=Inline
How to make a bookshelf out of crates!