I think the E46 and E36 look pretty good in flashier colors but definitely not the E9X. Even worse, not the E90.
I think the M3 is understated and subtle yet aggressive. I like all of the regular colors offered which compliment the car.
IMO, the only missing standard color is Monte Carlo Blue...should have been standard.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red