Check out this life-sized DIY Guitar Hero that can be controlled by soccer balls. (and probably any other kind of ball from what I can see)
This DIY Guitar Hero project was created using Arduino and projectors, certainly a really cool project they have done here.
An experiment to create a giant (three stories high!) guitar game controlled with footballs. Football Hero is played by a team of insanely gifted young freestyle footballers. The game is programmed with the Kasabian track Underdog.
Watch the video below for the DIY Guitar Hero in action!