The Best Bookshelves You Can Make On Your Own
The ladder shelf: Directions.
Telephone bookends: Let A Beautiful Mess show you how it's done.
The rope bridge: Get your literary bridge on here.
Read the rainbow: You're not building the proper shelf so much as building the proper collection. Collect the books you have, and color-code them. Probably the easiest DIY shelf idea with the coolest results, respectively.
The secret passage bookcase: Yes, you can DIY.
The invert: Flip that frown upside-down with these intructables.
The literal approach: Give old books the new purpose of supporting those that came after them by following these three steps.
The Knock-Knock: Who's there? LEARNING, THAT'S WHO... learn how to make it here: Yay!
The HuffNpuff: When a shelf of just wood won't do, throw in some bricks (worked for the little pigs). Apparently this one can be as cheap as $35. Learn more here.