Green
Green is a dualistic color. It can represent envy, evil, and trickery, and/or growth, renewal, and life, as lush vegetation. In Arthurian legend the green knight slew all who attempted to cross his bridge, until he was killed by Arthur. In this respect green can be seen as death's unbiased nature and the slaying of the naive. Information taken from: Online Symbolism Dictionary
Songs referenced:
Black Swan