I made a composition notebook cover based on a video tutorial I saw on Youtube. It's a really easy sewing pattern too. I made a paper pattern from some brown craft paper so that I don't have to measure every time I want to make a new cover.
I adjusted the measurements on the final pattern a bit because after I sewed the top stitch, it made the back area smaller, which meant I had to shave off a bit of the notebook on the bottom. I have 3 more cut out, but from different fabric. I'll show those later. Those will be in my Etsy shop.