Here is a cool robotic sculpture powered by the Strandbeest. The Jansen Walker by Eli Yoo is powered by a simple motor and rechargeable battery. It has a brass, stainless steel, aluminum, and wooden base. This piece has a footprint of 140 x 80 x 125mm.
You are going to need 2 batteries to operate this piece. As you can see, you can remove the robot and let it run on your desk.