In an effort to keep the gimmick of an integrated camera in Apple laptops interesting, the good folks at NotDustin.com created a little program called iStache. As the name indicates, you can take any picture on your hard drive (not necessarily those taken with an iSight, though I suppose that was the idea behind it), import it into the program, and add a moustache from a variety of styles. The one I currently sport is called “Poe Poe”:
However, one can also choose from, for example, “Straight Gayness,” or “The 6:30,” or for the calcium-motivated, “Got Milk?”
iStache is compatible with any Macintosh computer with OS X 10.4 Tiger. You can download it here.