I have, left over from some holiday sewing, some Pro Football team prints. I decided to make up some pillowcases with them and put them on my ETSY site. I had three team prints, and enough to make a set or a pair from each print.
There are a zillion free patterns out there on how to do these pillowcases with french seams, just google it and choose one that works for you. Many of them claim you can make one in 15 minutes, but it takes me about 25 minutes including cutting it out, sewing it, and pressing it properly. My biggest tip for you would be to use the Clover Wonder Clips. They hold the rolled top step of making the pillow case so much simpler and speeds up the rest of the project.