While eating lunch at a restaurant today, I was wondering if a couple things have been done in bitcoin-land yet:


1) Loadable paper cash
As we were leaving the restaurant, we left a few bills on the table for the tip. Can we do this with bitcoin yet? I know there are a number of physical bill solutions, but it'd be nice to be able to load them with precise amounts quickly when needed. This essentially amounts to paper Casascius coins... Something with the pub address (and QR) visible, but the private key hidden via some tamper-evident seal.


2) Edible bitcoin
I heard of a place that sells a $1000 ice-cream sunday. Something about edible gold flakes in it or something (sounds sketchy, but that's beside the point). Anyways, that could be done with private keys. "Print" the key on chocolate flakes or something (delete any other copies, obv), then crumble and eat. This would be horrifically decadent, which is obviously the point for idiots who buy such things...