MAT files are great! Excepting a few details, you basically take a CR2 file you like, and leaving the header & footer, lop out everything except the materials you want to change. And you can do it very easily in a plain text editor like WordPad. i have recently made a bunch for my own personal use, for older textures that i like a lot, or my own textures i like to use. That and a quick render & trip through RSRConverter (in free stuff, i think) and you have a nice looking and useful MAT pose!