damn what sort of noob conspiracy theorist are you?
indigo are babies born underwater in russia who have enhanced psychic abilities. (at least that's what i've been told by someone who spends fair money on books about this crap).
not sure on crystals though. my experience with those have been that they're headcases with major daddy issues.
elfen well... you know those skinny pointy ear people in lord of the rings. yeah. exactly that.