Robots I have built:
BCUbot: These 2 wheel drive robots were at Wilmcote primary school built using a laser cut perspex chassis as one of their Imagineering projects. It uses a PIC microcontroller driving an L293D dual H bridge for motor control all mounted on a prototypin board.
The PIC processor was programmed to accept a sequence of movement commands (forward, backwards, spin left, spin right) from 2 tactile switches. The robot could then be used to play roboskittles, where the robot has to be programmed to travel towards and then knock over as many skittles as it can