Highlights for all hair colors!

Hello everyone I just had a neat idea that I'd like to share with the Sims community and makers. You know how everyone wants the color wheel back and create a style? Well they reintroduced in Cats and Dogs. Well my idea is that they could make a system similar to that but for sims are more particularly, their hair color. What I mean is being able to dye hair any unique color you'd like, maybe brown with a blonde streak? Green and blue? Red and black? Yes I know there are mods for these hair colors but they don't apply to every hair like the Sims 3 did.