No one?

I understand that I can use the MathComponent Node to extract a color channel to make the diffuse color map greyscale. Or use the MathHSV Node.

I also understand that I can use MathFunctionStep to make something inverted hard black and white, and use MathFunctionSubstract to invert that

But apart from that I am stumped.

I dont understand the lightening nodes - other than the Toon shader I cant connect anything to the diffuseColor root node - ?