Create different color palettes for your project. Swap palettes very simply. Create color palettes on Adobe Colors, Coolors and many others, copy the palettes and directly use it within Unity. 

The best use case for this is mobile games specially hyper casual games where swapping out color palettes is very helpful to create different campaign videos to get the most optimal result.

The package changes color on the material and UI color values. But it is customizable so that you can use it as you require. The tutorial and how to do is provided in the documentation