We have a few vehicles and always buy second hand, so that mostly decides the colour for us.
Metallic brown estate. It looks like a warm dark silver colour most of the time rather than brown. We don't love the colour but it is inoffensive and was a good price at the spec we wanted, which is more important to us.
Red rocket hatchback. Bought for the same reason as above. I was apprehensive buying a red car as I've had 2 red vehicles previously and the colour fades terribly. In this case DH should put a load of miles on it and kill it before the paint gets a chance to fade, so we chanced it.
White van. I hate the colour, but you pay a premium for any other colour and 99% of everything on the second hand market is white. Mine is actually green/grey/brown most of the time which proves my point of why it is such a terrible colour choice. plus white looks cheap, even on top end cars
Camo truck. Sounds awful, but is actually awesome and anything other than army green would look terrible. It's totally in keeping with the vehicle. I had it resprayed from NATO green a couple of years ago.
I am not looking forward to buying our next car as although we're not that fussy about colour, there are so many white (and pastel) cars around they will be hard to avoid. I hate white.