I had carved out a linoleum piece representing a d20 specifically for this! You can see the lino piece down below. It was a lot of carving and hard work. Stared at a d20 for hours, but it was worth it!
I really like how they came out, I didn't expect such good results, but I'm glad this was the outcome. I'm working on another bag, different from these, it's a grueling process but so far so good!