My recent mission with robots and electronics was to make them out of "ordinary" items, such as this TV remote control. I like the idea of telling someone to fetch the remote, and when they do, I make it scurry away, like a rat.
This job was somewhat challenging because of the "thinness" of the remote control. Also since the width was fixed and I wanted to wheels to not stick out, I had to offset the wheels because of the gear motors inside. Looks weird, but it works.