Make Your Own Secret Hollow Book
I realize that some libraries just don't have the room to keep ALL the books it ever owned. In fact the special library I currently work in is going through the downsizing process right now. What a great use for those old unwanted books! Also, a great homemade gift idea. The fun part could be finding the right title for the intended recipient. Of course, if your replete with old unwanted books you could construct a Book Bar. But that's far too much work for me!