Here's an idea that Apple may not have considered for the front bezels.
For the blue, purple and green editions, why not use the color on the back of the display in place of the white glass frame around the monitor ? That's something that could work much better than white. With the saturated purple color shown below it could actually work quite well in my opinion. Not as good as black but much better than white.
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Make the Silver edition bezels black again, like the classic iMac look and leave the red, yellow and orange iMacs with the same white glass bezels they have now. Then potential buyers get to choose exactly what they want. Light white bezels or something darker that matches with the color of the chin and base. I should email
[email protected] to let him know about this. Not that my opinion matters much within the Apple ecosystem.