I would build a robot as a Drone that shoots Nerf harmless arrows! You could then have fun battles between friends.
By myriaddev
Other robots from Synthiam community

Wallekid1's Wall-E Made From Scratch
No Kidding, I actually made it from scratch, its not a toy It was quite a big project and I worked on it for several...

Rb550f's Jo Robosapien Project
I started working on this Robosapien project with making a new head from a 3d kids space projector. Fabricated face...

Lumpy's Lumpy's Roomba Rover
Hey All! Picked up one of those cheapy arduino wheeled platforms. It came with those cheesy yellow motors and yellow...