Okay but you know how Pico-8 cartridges are just PNG images with the game data appended onto the end? There is an opportunity for TRUE multimedia format innovation here I am SURE of it
Image Sonification?
This thing is what came up when i searched for it, no idea if it's any good, but the concept itself is really cool
edit CURSES there's fine print but for all you iphone and ipad owners out there go take a gander
(or this one which isn't free but again i have no idea how good)