My original plan was to print paper wallets and put scratch off stickers on all the private keys. Mix them up and add funds to some to make a bitcoin scratch off card.  But I assumed this would just be called a scam so I picked current national lottery cards as an option with the lowest prizes I could find so they would be easy for me to pay out in BTC.      If you can think of a way to do a bitcoin scratch card let me know because I want to make that happen as I love scratch cards and a bitcoin scratch card would be cool