we can see how this works..
1. new image of your desired size
2. create new channel-- alpha 1
3. Fill>Render>Clouds
4. in the Channels palette, click on the RGB thumbnail. switch to the layers pallete.
5. Fill>Render>Lighting Effects
6. set light to directional
7. select Alpha 1 in texture channel dropdown hit 'ok'
8. DONE.
if you want to change the colors then play with hue/saturation levels.
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