by the way my GT3 is silver with black so its not like I always go with louder colors. the appeal of the shape of the 1er is very color dependent. i think the proportions of the coupe look great (from pics, though they are not as good in profile with the hatch), it's more the detailing which you have to take a view on.
one way is to conceal it (darker colours) - but IMHO this means you are trying to hide something..
the other way is to go for it (lighter colors) - but IMHO this means you have a (metaphorical) big nose (but so does Tom Cruise)