In most of the customisation screens the only reference to the colour you get when you hover over it is an alphanumerical one or two digit code.
For most people this isn't too much of a problem.
For those with red-green colour deficiency it's slightly moreso (and presumably for all of the other forms of colour blindness out there.)
All it would take is to alter those little two digit codes into a brief description of the colour (EG. Dark brown, light brown, red, green... And so on.) It would make life so much easier when trying to work out "Is the hair I'm selecting dark brown? Or a dull red? Or a dark green?"