How to create a quick rock Background in Photoshop. It's surprising how you can create stunning photorealistic rock and stone texture so easily.
Create a new RGB Image of you desired size.
In the channels pallete click on new Channel. It will become alpha 1.
To reset the foreground and background colors. Filter>Render>Clouds
what you will see in alpha 1. Still in the Channels palette, click on the
RGB thumbnail. Switch to the layers pallete.
Set light to directional.
Select Alpha 1.
Go to Hue/Saturation and add some color if you like. For more on Hue-Saturation see the tips page.