Do you think that the walls at your school or office just aren't sprightly enough? E Ink may have a way to liven things up. Its new Prism material lets buildings subtly change colors and patterns on the spot, without having to rely on banks of expensive digital displays that stick out like a sore thumb. It's more than just animated wallpaper, though. It can respond to input, such as a person walking by, and even works for furniture -- imagine a bench that changes its look every day. Prism sips only a tiny amount of power, too, so you don't need to keep things plugged in.