Choose your book wisely!! Consider the strength of the binding, the attractiveness of the cover art, and the size!!! The book is going to experience a major transformation and hopefully begin a long new life so it is essential that the binding be strong enough to last. The cover art should also be appealing, as it will be "every book" in it's new life!! The book should also be sized so as to do the job with minimal weight. I selected an old math textbook that met the criteria for my needs.