Color coded rim or plain black, why ?

Hello Teachers, Staff and faculty
I need to be schooled and schooled right.. So with that in mind, I've come to the biggest if not BEST, Mopar Academic Institution in the U.S. of A. Not to mention all other countries.

Anyhow my question today is,

Why do some cars come with dog dish rims color coded like the vehicle they are on vs. others that have dog dish hub caps on plain black rims ?

Was this simply the customers choice at the time of order or was there a specific reason or cause that made the rim come the color of the car ?
(I.E. Car had callouts, hood scoops, performance engine (no slant 6, etc..)

All and any reply will be sincerely appreciated, suffice to say the correct answer will be amongst the remarks.

Thanks to you all, in advance.

Sincerely
Maps
(Student with "dunce cap")