Trying out my Sunpak 5000AF* flash for the first time with my 20D I accidentally severely overexposed a pic of my new kitty. Decided it would make a good sketch. Nothing much done except conversion to grayscale, some unsharp mask to increase the contrast and a bit of sandstone texture.
*The Sunpak isn't entirely compatible with the 20D. You can't change the ISO when it is on the camera.