I don't mind the current skin, personally, but I'm sure some of us would like a different design or colors. I don't think people would mind the option to have different color schemes for the UI anyways. It isn't too much of a drastic change, because ultimately the UI would still be coded the same, just differentials with the color codes.

If anything, I'm sure the addon developers wouldn't mind creating addons to alter them if you were to allow them to do so.