I didn't realize things like this existed until I entered our new church building's bathroom to find two trash cans with motion sensors for opening and closing! (theinspiredroom.net)
When it's finally live this winter, it'll use your Android device's camera, processors, and motion sensors in order to serve up immersive interactions. (pocket-lint.com)
Use timers or motion sensors on lighting so you're only using electricity as you need to. (remonline.com)