A really in-depth tutorial on how to create a nice StarCraft style wallpaper. Download out of Internet the same texture we have below, that must have
1600x1200 px and
72 dpi.
Press
CTRL+U
Next press this combination of buttons:
CTRL+L 
It’s time to use the
Rectangle Tool (U) to dark out the picture’s edges:
Set the next parameters for the last made layer by making a mouse click on the processed layer on the layers’ panel:
Fill 0% Blending Options>Gradient Overlay 
Gradient’s parameters: 
