We built an image-through-sound sharing app at IPO48 hackathon this february - one of mentors there was trying to convince us to upscale that from funny entartainment utility to an e-commerce, but we didn't see a business oportunity... Our bad :)

If you are interested, see our demo Android app at http://www.youtube.com/watch?v=ElkmzoqD9PM (or search Soundwise on Android market).

Tomas Kafka from MobReactor