is it possible for someone to end up with purple pubic hair?! lol :P a random debate with a friend! even a genetic mutation surley would struggle to make purple - but if scientists played about with just those genes could it be possible?
see now i think electric blue or purple natural hair would be pretty cool :) or a vibrant red :P
Err returning to the original question, no it's never likely that anyone is ever going to be born with purple pubic hair. The requirements for this to happen from a genetic viewpoint are impossible to achieve. the same applies to the other colours proposed.