Down-to-Earth:
Brown is a natural, down-to-earth neutral color. It is found in earth, wood, and stone.
Culture of Brown (Brown Culture?):
Brown represents wholesomeness and earthiness. While it might be considered a little on the dull side, it also represents steadfastness, simplicity, friendliness, dependability, and health. Although blue is the typical corporate color, UPS (United Parcel Service) has built their business around the dependability associated with brown.
http://desktoppub.about.com/cs/colorselection/p/brown.htm
I'm pretty sure it's the Ninja of the colour world.