My daughter wants to program a robot to recognize her brother and tell him to go away whenever he goes into her room. Figuring out how to arm it with a nerf gun would probably be her second project.
Other robots from Synthiam community

Johnnybib's Ezrobot Elasitc Band Turret
Elastic band turret. Its cool... so I made it. Aiming is hard... Sorry for garbage quality I filmed it on a Galaxy S II...

Leversofpower's Un2003a 28Byj48 Stepper Motor Project
This is a tutorial for implementing UN2003A 28BYJ48 stepper motor controller combo. This motor stepper controller combo...

Louis's Quadrupedal Robot Xr4
Hey guys, I have just started a new robot project. This one is going to be a Quadrupedal robot which has 4 legs...