This is my first tut, comments appreciated!

if you've seen this otherwise I apologize, I did not mean to rip it, it is simply something I have figured out during my time with Photoshop.

Open a new picture (any size, though I always find that square is best with anything)

Filter>Render>Clouds

Filter>Render>Difference Clouds

Image>Adjustments>Hue/Contrast
Make sure that the colorize box is checked
use the hue and contrast sliders (not lightness) and choose whatever color you like

Now duplicate the layer

Change the new layer's Blend mode to Difference (you should now have a black screen)

on the duplicate layer:Filter>Sketch>Chrome
(the duplicate layer/difference/chrome technique is something that I have found to be useful just about anywhere, its a pretty interesting effect.

viola!