By viewing this tutorial, you should just have completed the Electric Metal tutorial .
1. Duplicate the layer and set the blending options to screen
2. click Filter > Distort > Wave - and click randomise a few times to make it look good.
3. hold CTRL and press E to merge the layer down.
5. duplicate that layer and set the blending options to screen
6. click Filter > Distort > Wave - and click randomise a few times to make it look good. (the 2nd time we have done this)
7. hold CTRL and press E to merge the layer down.
8. duplicate that layer and set the blending options to screen
9. click Filter > Distort > Wave - and click randomise a few times to make it look good. (the 3nd time we have done this)
10. hold CTRL and press E to merge the layer down
More Tutorials: 
cool trick.but what did you start out with? did you render clouds or anything.
Id like to try this for a background on a banner..
tia
cooldeals2go