I dunno about making texture maps but there is a pretty cool toony style asset of shaders on the blender market called Kamikaze Shader Pack. It is a group of shaders that make a 2D feel much like a comic book. If you are into shader nodes and know your way around I would recommend this pack. And you could probably adapt and learn from how it shades.
It only works in ever but reacts to real-time lighting. You can check out my gallery where I have used it a few times.
I had some problems with it using a MacBook Pro 2011 model, but on windows it is flawless.
It also doesn’t transfer out of blender into Unity. Hope that helps.
