That was funny, Mike.
I think the marble effect comes from putting a piece of Saran Wrap over wet paint and then lifting it off. A friend of mine did it on his Harley gas tank and it looked terrific. If I remember correctly, he sprayed a base coat and let dry, followed by a different color with retarder added so the paint wouldn't set up so quickly. I'd like to know how it's done in scale, too.