This is just my opinion but I think that the black mud flaps look terrible on a silver car (mine is Iridium too). I've seen a silver Hyundai Tibaron with silver mud flaps and you don't even notice them. The mud flaps will help minimize the dirt kicked up onto the fenders. The choice is your.
See my previous post & piccies - Woollies Wheels - Andradite Green(fairly dark) with front & rear flaps. They make a helluva difference - cut down totally on the mud sprayed over the sills and back end, but IMHO they would not look so good on a lighter coloured car.
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