And, to make it even more fun, take tiny bits of undisolved dye of the same or a contrasting color and lightly sprinkle or dab on as a second or third color. Lightly spray with a fine mist, and apply the cloth. That separates some of the shaving cream and the concentrated dye makes the spider-like veins that marble has.
This gives another really cool effect. Reminds me of the late 60's and Hippie days!
Hmm..I reckon I could be called a hippie now, but it is more the physique than the "peace and love child" kind.