Homemade guitars

Basic instructions:

1. Take a shoebox and cut a hole in the top.

2. Place several large rubber bands of various widths around the box to make a guitar.

3. Keep in mind: Plucking of the rubber bands causes them to vibrate producing various sounds. The thicker the band, the lower the note. The thinner the band, the higher the note.

Other ideas:

Oil can guitar.
Another option.
Who knew? HGTV.
My favorite.
All the pretty flickr pictures tagged homemade guitar.