This tutorial teaches you how to make a 3D background for your images.
'Open a new document and fill it with white. Go to FILTER>>RENDER>>CLOUDS.
Now press CTRL+U to get to adjust its Hue and Saturation. In the Hue/Saturation menu bring the saturation all the way down to -100%.
Now go to FILTER>>STYLIZE>> EXTRUDE. Set the extrude properties to anything. I chose 25 size and 70 depth. Make sure Type: Blocks is selected.
Final Result