I see a lot of "almost" bookshelves. They hold books and look "design-y" but they waste energy and space. If you are really into books, it's not about the cute shelves. It's about the books. Make that space hold as many as it can.
How cool is the Tree Bookcase by Roberto Corazza? This single-cast plastic bookcase is open on both sides allowing it to be attached to a wall or standing freely, leaving access to the books stored on the "branches" of the tree.
21 Creative Storage Ideas for Books, Modern Interior Design with Wall Shelves
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ooh this is great for unfinished basement stairs (book-staircase). I love the idea of book shelves in between the stairs. This would be especially helpful for a small home and a book lover that needed more shelves.