I love your idea! Is it possible that you can make cards for other cryptos? (Klondikecoin, DigiByte, USD-E, Noblecoin, Devcoin, Feathercoin, Worldcoin, just to name a few) If you need a wallet generator I found a universal one from this guy:

https://bitcointalk.org/index.php?topic=386670.msg4162188#msg4162188

hope this helps

If you don't Id still buy the dogecoin and infinitecoin ones, just a thought.