I don't mind flat colors at all (I'm considering maybe kumaru or comfortably cat bangs for more stubs)~
We just got so few multi-colors at the time it's like "well maybe if I ask for fallen hair, well get some fallen stuff?" redface
Stubs can use any color so long as they have the right number of accessories.
One of my poses is Twilight but I had to solidly split it between hair, bells, and barettes.
You could do any solid color combo of those seabreeze/offwhite/offblack as long as the original had 2 colored accessories. [and that's what you wanted]