Black.
I nearly got my Note 4 in White, but really preferred Black, same with S4. My Sony Ericsson W800i Walkman Phone was White and Orange back in 2005, was pretty awesome, had my Galaxy S2, S3 and iPad in White to, but got over it.
WRT colours like Green, Red etc... I think Nokia did a great job with for example the N8, mine was Lime Green, looked great thanks to the metal body and chrome accents, and the Lumias look good in those bright colours.
Never been a fan of Gold, be it the Gold Note 4, iPhones etc...