Go to Filter > Render > Difference Clouds again. Then hit Ctrl+F twice (this will render Difference Clouds two more times - so in total you have 3 Difference Clouds renderings).
Go back to Layers panel and then go to Filter > Render > Lighting Effects... Set the Texture Channel to Alpha 1 and the other parameters as you see in our picture and hit OK. Your now have a really good rocky texture.
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