I have developed my own color system library where I can quickly pick and choose my clay colors and recipes for easy combining. It is a simple system that allows for expanding to more color options and at the same time keeps everything organized. I also developed my own color base "recipes" for mixing up new colors, shades, hues or blends.
My new tutorial on color combining will be available shortly and I plan to share all this with you plus more. Although my recipes are for Kato polyclay, I understand that many prefer other brands and so my system can be easily adapted to them.