Here's a little Photoshop action improvising a mechanical creature. It's an arachniform, that is, a spider-like form done in robotics. I think a spider is an ideal model for a robot. It would be stable, swift, and might even be able to climb walls, if it were small enough. In a large version, it would be able to crawl over broken or rugged terrain. Its "palps" or mouth parts could be adapted to all sorts of tasks. This is meant only to be a sketch and the leg mechanisms are not meant to be "realistic" representations of what it would "really" be like.
Done in Photospider, about 10" x 6", December 27, 2011.