Random
Random is a strange creature. It doesn't seem to be affected by scale. That's not a typo below, the global scale was set to 2000, but it's not much different than at 250. Good when you need the finest noise possible. Could probably be used for static or white noise on a TV screen when animated.
Grayscale	Scale 250, Height 5	Reversed
Planar	Scale 50, Height .5	Scale 2000, Height 12