Simple colour harmonies can be picked from a hue circle using rules of various polygons. Why not just spin around with that until you find something that suits

Simple colour harmonies can be picked from a hue circle using rules of various polygons. Why not just spin around with that until you find something that suits your application? Then you can tweak it as needed rather then using some predefined palettes. Related: Built a tool for switching between hex and Munsell notation for OSX, https://github.com/germ/munsellScript https://github.com/germ/munsellScript