Love this question, and reading all the responses - so interesting!
As LaPed mentioned, to me, the only true neutrals are black, white and gray, since I am super-picky about how any fashion neutrals are mixed with colours, so they don't totally work as true neutrals for me (obviously this is different for everyone!). That said, for the purpose of this question, I'm thinking in terms of fashion neutrals (i.e. navy, beige included as a neutral) in which case my wardrobe is probably 80/20 in favour of neutrals, if not more.
Of the 20% colours, like notsaf, most of the colours are quiet - light blue, blush, burgundy, deep green, soft teal. I can count on one hand just about the number of bright pieces I have!