I guess it was only a matter of time. My son, who has every single Lego ever produced on this planet and those of the surrounding solar system, has discovered model paint.
No longer able to live with the restrictions placed on his creativity by the standard colors of Legos, he is now painting pieces in order to more realistically depict the various creatures he wants - uh, depicted. Right now, he's making a Predator, from Alien vs. Predator.
It's only a matter of a little more time before I have to find a way to remove paint from the carpet, but what the hell.