This is a project I made myself.
The shooterbot drives straight, when it comes to an obstacle (wall or something else), he will make a 90degree turn and continue straight. This loop is endless.
For fun, I added a green light when going straight and a red light when an obstacle is detected.
I was playing around with the sound possibilities of the NXT, and putted a bit “West Vlaams” in the NXT
I can send you the program if you want, just post it in a comment.