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Here is a quick and simple way to make a rocky texture:
- Create a new canvas with white as your background colour.
- Create a new Alpha Channel by clicking the 'Create New Channel' button in the channels window.
- The default channel name will be Alpha 1. Select Alpha 1 and go to Filter > Render > Clouds.
- Now, select your Background layer, the clouds will disappear.
- Go to Filter > Render > Lighting Effects.
- Select Directional from the Light type drop-down menu.
- Select Alpha 1 from the Texture Channel drop-down menu.
- Position the lights until you get a desired amount of lighting.
- Hit OK.
- With the Background layer selected, press Ctrl+U.
- Hit Colorize and then OK to get a rusty brown colour.
- You can adjust the Hue, Saturation and Lightness to however you want though.