Heh, I always wondered what the "key" meant in key lime pie*. I didn't know there was such a thing as a key lime. Although, now that it's been cleared up for me, it makes sense.

*While you hear the term and hear key lime pie, I was always hearing key lime pie and wondered if "key" was some sort of reference to the tartness or something. Learn sumpin' every day, eh?

I've still never had one that wasn't green. Some are lighter than others, but they've all been green.