I know what your talking about. That tutorial has been around awhile. So you can find it on http://www.good-tutorials.com
I don't know the name of it off hand but if you go there and search long enough you will find what your looking for.
I was looking the recently made sigs thread and I came across this sig
http://img136.imageshack.us/img136/8149/tudo9ls.jpg
I want to know how was the BG to this colored? Because it looks complicated but I'm guessin it's everything but.