There are several different ways to make book wall art. Use your imagination! Some use the books as a canvas and paint sayings or pictures on top of them.
DIY Built-in Bookcase : 6 Steps (with Pictures) - Instructables
Library Wall Plans - A Beautiful Mess
24 DIY Bookcase Makeovers to Transform Your Bookshelf
New and Improved Fireplace, Courtesy of Slateish Wall Covering
HEWN Flooring Durable, Beautiful Floors For Our High-Traffic Home
A Book Wall tutorial. How to construct a beautiful wall of books
A Book Wall tutorial. How to construct a beautiful wall of books
Creating Built-in Wall Bookshelves
Leading lines 6 Workshop, Lines