This project won the NI Intern myDAQ Competition.
This is an Air Guitar is made with LabVIEW, a myDAQ, and less than $25 worth of supplies. There are two ways to play this "guitar." First, you can play different notes based on the "string" you choose with your right hand and the note on that string you choose with your left hand. Secondly, you can play the song version, which lets you effortlessly rock out to songs like the National Anthem just by holding a "pick" and strumming.
Click here for instructions on how to make your own.