They should use all of the colors as appropriate. Also, I love the color purple (not so big on pink, but it still feels right in certain areas. Flowers, some clothing.... I'd like to see a mix, and potentially themed. For instance, if you're in a mansion that belongs to a noble house that has a crest of a stag on a red background with yellow accents, I'd expect a good amount of those colors in their mansion, among others, of course.