The old-fashioned kind of notebook, I mean.
I've actually finished it by now--took this picture when I still had a bit more to do. Basically, I just crocheted enough chains for the width. On the back I tried various stitches but found this plain chain one, single crochet pattern the best. Each color is two rows. I would say, though, that if I were to make another one I'd add at least 2 more chains. I have to stretch this a bit to get it to fit nicely. Btw, the 'flaps' are about 2 inches folded inside and sewn in place.