I think this quote is pretty cool and not to mention extremely accurate. Courtesy of Thebananatree, which I found through Bathroomreading (BTW thanks for the comment :)
Whenever there has been some point in a country or culture's history where they have interacted, whether commercially, colonially, or competitively, with a group of people physically unlike themselves, the green gene was shown. Unpredictable, inexplicable, and mystical. Green eyes are arguably one of the most mysterious and entrancing physical traits.
Hmm ... so which one of my ancestors "interacted" with someone "physically unlike themselves" ... I'm betting it happened on my mother's side of the family.