Attached is an example of and the gradient itself. For the example, I was using Zinx's More Realistic Haircolors, another gradient modification that I recommend. My gradient does not include Zinx's work. If you want to use both, you'll need to combine them using your favorite image editor.
You are: Free for commercial and non-commercial use. Free to repost. Free to edit. Free to attempt to take credit for, so long as you follow local rules regarding theft; the timestamp is my witness. Credit is not needed, but appreciated.