Sensors in your fridge keep track of ketchup, milk, and butter. Data is used to auto order these goods when they run low.

Flashy LED decor lights that respond to your bike's motion.

Build a beautiful “infinity mirror” Illusion that you can control by changing this mirrors' orientation. Rotate for changing colors!

You can make someone else's sunglasses see-through via BLE and check them out from far away, perhaps with your heartbeat.