Frodo's blue eyes are indeed natural. What is unnatural is that ENTIRE SCENES were changed, with the swipe of a mouse, to nighttime. You can see this being done on the Extended Edition CD, special features. I believe it was a Lorien scene but I'm not ceratin; however, they change it from daytime to dark, and in those scenes, as the entire scene darkens, Frodo's eyes end up looking basically purple.
Not his fault.
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...down to the water to see the elves dance and sing upon the midsummer's eve.
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