What if tattoos could talk? That's what Nate Siggard, CEO and founder of Skin Motion, is trying to do with his soundwave tattoo app. It works like this: users can upload sounds and voices to the app, creating a waveform of the audio. They can print out these waveforms and have them turned into tattoos. They can point their mobile phone or tablet device at the tattoo and use the app to play back the sound.