This was posted next door on CRAFT, but I thought it was interesting enough to post here too. I use the pocket-sized Moleskine Cahiers and they look just like this. I actual did make one of my own, using some black lightweight card stock and 1/10 graph paper inside. It was easy. I saddle-stitched it and rounded the corners with scissors. It didn’t look all that different from the commercial black-cover Cahiers. These sewn-bound ones look great.

Cereal Box Journal