I just finished making my yellow-backed Calculus pillow. It has soft fleece on the back and my Calculus fabric that I made on the front. Here is the link for the Calc Fabric: http://www.spoonflower.com/fabric/1147427. It took a lot of stuffing to fill it, and I probably should have made it with an insert instead of filling, but meh! I love it anyway! Should help me get comfy when I need to do my Calc homework! haha. And yes, it is made from actual Calculus homework! :) Yay!!!