1 New document 400 x400
2 Set colours to default “D” and change to the gradient tool
3 Set the gradient tool to radial and the mode to difference
4 Drag a few gradient 5-6 till you get something like this.
5 Select all CTRL A then copy CTRL C
6 Go to the channels tab and create a new channel ( alpha 1) and paste CTRL V
7 Return to the layers tab and deselect CTRL D
8 FILTER>RENDER>LIGHTING AFFECTS
9 Add a layer fill it with a pattern and set it to overlay.
You can substitute stages 2, 3 and 4 with render clouds for rock texture :/
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