ALSO: If you use Green and Yellow together, please try to avoid any combination that looks like the Green Bay Packers. This is Minnesota Viking country, and people seem to actually care about that sort of thing.
For reference, this is the Packers logo:
http://blacksportsonline.com/home/wp-content/uploads/2014/04/images-15.jpgI like green, yellow, and white - but try to avoid THAT green, yellow, and white.