here's the link, it's on DA and it's a vid tut. http://www.zerodesignz.net/forums/index.php?showtopic=139 If you don't want your render two different colors like mine just do the coloring step last.
OK, OK, I'll reply... I liked the tut, I have used the same technique myself before...here's one of the sigs I made with it: I rendered both of the images myself...the BG sucks tho...