A scissor or even better a scalpel.
A note pad, you use the side where the papers are glued together.
A cover of the book you want to make. I played around in photoshop with my favorite books so you get backside and everything.
a: Place your cover around the glued side notepad and cut around it.
b: Glue the papers to the bookcover.
....and there you have it, a book!