Here in CT the Tridion color is the color that is recorded on the vehicle registration. The Tridion cage is the only exposed item where its color cannot be 'easily' changed.
If you want to paint the plastic panels, it's best to have painted panels to begin with; as the surface is already prepared for painting. From what I've read the white, black, and yellow are the color of the plastic as well, and those will need to be primed, etc.