Almost all the Audi car colours are in the link's below
http://fourtitude.com/emAlbum/albums/Design/Paint Colors/
http://gtcarlot.com/colors/Audi/All/ (Credit to @naughts4187 for this link)
http://forums.audipassion.com/topic/172873-petit-tour-dhorizon-des-couleurs-audi/
(French, but the colours are English - credit to @Foxtrot_Oscar for this link)
Should keep you busy for a couple of hours looking at them all
http://fourtitude.com/emAlbum/albums/Design/Paint Colors/
http://gtcarlot.com/colors/Audi/All/ (Credit to @naughts4187 for this link)
http://forums.audipassion.com/topic/172873-petit-tour-dhorizon-des-couleurs-audi/
(French, but the colours are English - credit to @Foxtrot_Oscar for this link)
Should keep you busy for a couple of hours looking at them all