This is one of the first Substances I made and I take no credit for it. It's from a really great tutorial.
If you want to learn about shape control I very much recommend. If you don't feel like watching a tutorial I recommend going and playing with the Gradient Map node and colour/gradient picking from a bitmap. You'll get a great range blend. you can grab from images open in your browser.
https://www.youtube.com/watch?v=dSfIERQUm4I&t=1258s