Sir Ben Heck,
You should build an autonomous blimp that will avoid objects. Maybe it could have a little wireless camera so you could have a birds eye view. This could be pretty easy, a simple suspended platform on a helium balloon or ballons. A couple of small motors with fan blades on them. Perhaps an Audrino microcontroller for the "evil brain" and some ultrasonic sensors for detecting obstacles? Lots of cool components to work with and could be the foundation for very cool user projects...
Roy
