Build this bookcase.
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Framed bookshelf by Mark Taylor Design. Love this!
DIY Book Shelves
A tree branch bookshelf is perfect for a child's room
Steampunk Piping Bookshelf - $74.99 | 16 Unique And Awesome Bookshelves For Every Budget
The lack of space for books is so astonishing that I cannot in good conscience call it a bookshelf, but it is an innovative and attractive decoration. Perhaps a room divider or window screen of sorts.