Originally Posted by Vox

It's where you take an image (typically from google images or planet renders or some such site) and then paste it into a 128, 256 or 512 squared image, then distort it to match the head distortion (this involves shrinking it's width to half, and distorting the edges (often smudge) to deal with the pixel crush or stitching lines at the back) and selling it off as if that really took any work at all.

The iron man head texture I made was a glorified copy/paste head texture, I brushed a whole bunch but at it's core that's what it is. (At least I give mine away from free xD)

http://forum.toribash.com/showthread.php?t=118648


Source:

Originally Posted by Slycooper

There's no outright tutorial on it, but it's a skill you'll pick with gimp or PS or what have you about taking elements from other images, cutting them out and putting them in your image, and distorting or painting over them to map onto your texture. Some HD transformers sets you see around were made from images of trucks or motorcyles, things like exhaust pipes or tire rims were cut out and pasted onto a hit and distorted to be eyes or details around a face or legs.

Just learn how to scale/distort images, and learn proper texture mapping.

http://forum.toribash.com/showthread.php?t=158676
http://forum.toribash.com/showthread.php?t=241808
http://forum.toribash.com/showthread.php?t=157854
http://forum.toribash.com/showthread.php?t=396812