I actually sold a line of silver coins that were engraved with Mythical Creatures and private keys to store BTC. They weren’t too different from these coins. I’ll post the link for you if you wanted to check them out (although I don’t think bitcointalk has fixed their image issues yet). I don’t make stuff like this anymore because it was a lot of work, but they’re still out there in the wild somewhere.

https://bitcointalk.org/index.php?topic=1569298.0