Riffy

Riffy is a collaborative art app. Riffy users can use their iPhone or iPad to doodle, remix, riff on, graffiti, tag and otherwise add their own personal perspective to photos. Users can start by either uploading their own photos from their camera roll, or directly contributing to any image in the collective ecosystem. When they upload photos from their camera rolls, they can choose to remain private or allow doodles/contributions from the entire Riffy user base.