On top of my head.
Dopesheet in grease pencil mode. Can’t find those dark gray bars colors
NLA editor. Can’t find those blue/green bars colors.
Graph editor. Those “rgb” colors are nowhere to be found.
The playhead text can’t be changed.
Image editor. If you click on a image, a black bar with numbers appear at the bottom, we can’t change any of it.
The origin indicator, I’m pretty sure we can’t change those colors.
I’m pretty sure there’s more. 