Brainstorming my first project, quick and simple questi Sewing Machines Parts and Sales in Los Angeles

Hi everyone,
Excuse my formatting, as I’m on mobile. I got a sewing machine for Christmas, and I’m incredibly thrilled 🙂 I’m interested in making pillowcases for my first few projects. I did some browsing on the subreddit, and I understand that I should plan on sticking with cotton fabrics for a while.
I’m thinking about making a Calvin and Hobbes pillowcase, but I can’t find fabric online with Calvin and Hobbes. I used google and I checked etsy. I’m not really sure where to look. Has anyone here ever used fabric with a Calvin and Hobbes pattern? I’m just brainstorming ideas right now, so it’s no biggie if the pattern doesn’t exist. I have lots of other ideas too! Thanks for your help and advice. I’m really looking forward to my new hobby 🙂 🙂