This is a little experiment I'm doing involving webscript.io.
Using Instagram's real-time API it subscribes to a certain hashtag, and sends any photos that are posted with that hashtag to a printer via Google Cloud Print where they're automatically printed.
So far this is basically just a proof of concept - the Google OAuth token is currently hard-coded into storage which means that after a certain period of time it's just going to expire and the app will stop working.
Watch this space.