Had a ton of fun creating these notebooks!  I went with a theme and created a loose set of books themed around "Earthbound," one of my favorite SNES games.  Used mostly chipboard for the covers, but a variety of things for the spines and inside covers.  Can't wait to make more.  It really is simple, and once you've created several, the process speeds up significantly.  I've made quite a few already, and am really pleased with the results: