wow someone who is more Star wars geek them me! O_O
well if you guys want use Star wars as examples, lests go, we all see in the Space battles we have a distint colors for the empire laser and the rebel laser, the color dont show if you are evil or good since the colors change in the old to the news movies, but it works to make easyer to undertend the space battle...
Diferent colors for the atacks are important for you dont get lost
in the magic works for you to know wich type of magic, the guy is using, i think Stan Lee point this in one interview, that his team uses the same color for psychic and sinetic powers, them two mutants if this powers fight, it get very ugly...