Here is a link to a video on Art with Salt by Bashir Sultani. He makes an image by sprinkling salt on a flat surface and then manipulating it into an image. This image is of the late Heath Ledger as The Joker from The Dark Knight. I choose this one instead of the other because I grew up watching Batman and Joker was one of my favorite characters. So it was an easy pick for me. He also did one of a salt shaker, of Johnny Depp from the Pirates of the Carribbean, of Homer Simpson, and of Angry Birds.
http://www.youtube.com/watch?v=y5bh80dIH4U&feature=relmfu