I keep separate folders for each icon creator that I save icons from. It's the only way to be sure about crediting. :)

And don't forget that Karl basically started out on Hercules as "Cupid" (the blond stubble was enough to do me in) and on Xena as Julius Caeser (very self-centered character). And although I haven't seen it, Jax says it's good--the Doom movie also stars Karl. :)