Photoshop tip

Borrowed from Scott Kelby

To create an instant background with a feeling of depth, first apply the Render> Clouds filter then use Blur> Radial Blur with an amount of 100 and zoom as the Blur method. Then use the Distort> Pinch filter using 100 as the amount. You can press Command-F (PC: Control-F) to run the Pinch filter several times to make the effect more pronounced. (If you didn't use colors when you applied the Clouds filter, use the Hus/Saturation command to add color to the effect).