My thinking is that his eyes change color when he's mad in TTT. When he's telling Aragorn that there is no hope or something (sorry I just woke up) before Helm's Deep, they're brown. When he's normal, they're blue. I'd hope a film maker as fabulous as PJ wouldn't let something like that slip!
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*~~All that is gold does not glitter, not all who wander are lost, all that is old does not wither, deep roots are not touched by the frost...~~*
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