Ok, so since we can use overlays to change matcaps colors, I think it could be great to make matcaps per type.
An we will not have the same matcap with different colors.
- Plastic
- Metalic
- Clay
- Ect.
Like this we can have a bunch of great matcaps without having more than 20 for example.
I made a scene to create matcaps.
https://www.dropbox.com/s/2kp13hg71oeaewm/matcap_creator.blend?dl=0
Also, I created 2 videos to show you how to create your own matcaps, if you prefer make a different scene.
