I love the very BEAMish practice of using the components themselves to create the bodies of your robots. Here, a standard 2-column breadboard, a battery holder, and two hacked servos create the body of the bot. The RBBB, from Modern Devices, is the brain. A Sharp IR sensor, a regular servo, some wheels, wire, and you’re in business.
Easy Arduino Robot [Thanks to Shawn at Arduino Fun!]