First off, don't get me wrong. I LOVE the idea of a villager with green hair. I just hate the shade of green chosen. It looks like drying grass.
So I pulled the image into GIMP and made it a little darker and a little more blue (as well as some other colors I can't remember). This mod makes the green haired girl's hair a bit more "christmassy".

Preview (not in-game, sorry!):