Orange.

But I might be biased. ^^;

A lighter blue, or i use a very light tan from time to time just because that's what my apartment wall colors are...I change it up depending on the room too. It's easy for me since I was going to school for Architecture

white is for clearance and peace, the red, orange and yellow ones are for a confortably and warm room, also blue is for a cold place to stay, green is for the plant lovers and that is all i know about this theme

i guess it would have to deal with the characters that own them, or the environment, different colors do different things, and it's fun little things to learn, like blue keeps people awake, red attracts attention and improves sales, and yellow i think is supposed to be calming, or energetic. though other colors are good for asthetics alone as well