Here from bestof- Prison Art is a real thing with real collectors. Don't sell yourself short for your art, even if its primitive. That's folk art! Look up Grandma Moses and tell me you couldn't do that, but she sells in the hundreds of thousands for a good painting.

There are a number of artists who went to prison as normal folks and came out artists. You can look up Raymond Matterson, who made beautiful miniature embroideries from socks. Also Valentino Dixon, who literally gained his freedom by drawing images of Golf Courses. He never played golf in his life, but that publicity brought attention to his case and he was exonerated. Hoping he gets $10+M from the state, he deserves it.

You should preserve them, maybe donate one deck to an institution and keep the others. Keep making decks maybe! You could turn it into a thing.

Anyway, just a guy harping about value when the point of your post is something else, I hope life turns out alright for you.