Violet eyes, they're watching you....

In a lot, A LOT, of the books I've been reading lately, the authors seem to like giving their characters violet eyes. Now, this has been driving me nuts, I mean, come on, there's no such thing as violet eyes, right? I'm imagining these characters looking like space aliens with flaming purple eyes. Well, I googled it, and apparently there ARE people with violet eyes. I don't know, in this photo of Liz Taylor, her eyes DO kind of look violet. Huh.