bio-degradable drones

http://www.fastcoexist.com/3038984/this-bio-drone-grows-itself-and-then-melts-into-a-puddle-of-sugar-when-its-done-flying?partner=rss

"The shell of the drone is made from a mushroom-like material called mycelium, and cellulose coated with the same protein used to make wasp nests waterproof. Inside, the circuit board is printed with silver. Most of the materials—apart from a few components, like the motor—are biodegradable."

I like all this thinking outside the box. A lot won't really work out, but some will.