Since when is black-and-white "ugly"? What if the person looking at it first prints it on paper and then reads it offline? If I were ever to make a color CV, I'd make sure that it looks ok printed on a laser, BW printer. Or I'd make another version for BW only.
Just trying to be witty, I've renamed the option "print". But basically the idea is exactly what you suggested: have a version which can render OK on print and where you can specify exactly what shades of gray are used in print (or plain black).
