I recently read a post
(but i can't find it now, it may have been older than my existance on ebid)
about upcomming? changes to ebid,
said the colors would change.
It reminded me of an un-written rule of comic book art.
Heroes always wear primary colors.
Villains always wear secondary colors (like green & purple)
No offence, i'm just sayin...
Wired magazine checked it out, and found it to be true of 90% of the characters.