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Wow. I can't believe how hard it is to get people to answer a hypothetical question.

OP, if I had to pick between a red and green iPhone, I'd pick green. But as long as silver/white is an option, that's my only choice.

If I had to pick one of those colors, Yuk....I wouldn't. Don't like either. White/Silver/Gold/Rose Gold for me
 
My own taste is gold( not the current color ) with black bezel and another color is completely black. I mean rear part the same color as the front face.
 
Either color would clash too much with my wardrobe and accessories and would be too conspicuous even in a case, for the parts that would still be visible. But I think they could be pretty. Just not for me. Of the two, I would probably prefer green; it's more soothing.
 
I would be more than happy with it. People buy red and green cars, wear red and green shirts, own red and green purses and wallets... The list goes on and on.
 
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