Jinsun Park's Exact Color Marker Pen concept. It's a marker that scans color and the marker is loaded with tiny ink cartridges and a color sensor, to provide exact color. Just a concept, but still neat.
This is such an amazing idea. I've already thought of two things it might be useful for: a) No headphone cords when running. b) No headphone cords if you fall asleep (just in case they get wrapped around your neck)