Yes I have it. I always try to paint cars in their 'correct' colours. Failing that, I choose the darkest shade of grey available, but never black or white. I also always paint cars with chips from the same manufacturer, otherwise it doesn't feel right.
For example, I have the following rules:
R34 Skyline - Bayside Blue
R34 Skyline Nur - Millenium Jade
NSX (pop-up lights) - Formula Red
NSX (non pop-up) - New Formula Red
S2000 - Indy Yellow Pearl
Ferraris - Rosso Corsa
Alfas - Rosso Alfa
Old British cars - British Racing Green
TVRs - Reflex Purple
Aston Martin - Solent Silver
Yaris/Vitzs - Super Rev V
GTO/3000GT/FTO - Pyrenees Black Pearl
Imprezas - WR Blue Mica
And so on and so forth...
