During my junior year, I took part in a group project to conceive, construct and compete an autonomous robot that must either remove from the ring or incapacitate another group's robot. We were given supplies with which to construct them, such as a chassis, servos, sensors, an arduino, other circuitry bits, etc. We were also allowed to construct a weapon of our own design, however it had to make use of the given electrical components, if any.
We came up with a design that made optimal use of the limited resources we had (e.g., batteries, servos, pins, even processing speed). The thin, broad wedge in front helped it push other robots out of the ring, while panels on the back and top protected its sensitive electrical components from an opponent's weaponry. On top you'll find the menacing hardened-steel spike that I designed and machined myself. It leaves quite an impression!
We worked together on the electrical design and coding, including the 51-hour marathon push to the finish! Our 'bot made it to the 3rd round of the class-wide elimination competition.