I think having one that would shoot darts would be cool. Take a robot like Rollie and add a dart cannon to him and make him like a tank.
By Dove
Other robots from Synthiam community

Rb550f's Okio J5 Style Robot Project
This is OKIO J5 style robot made from an upright vaccum cleaner. The head i made from a dremel accessory toolkit and led...

Jstarne1's Nano Smart Aquarium
Ok this is the second project where EZB will be used to control lighting , current flow , temp , salinity ect. This...

Rz90208's First Look At Fud2
Finally got around to taking a picture of my current Bot FUD2.