Well, with all the new and recent minifig hair molds, I think it is time to reintroduce the Service packs with this in mind. You have a nice palette of colors to choose from now. So here is the list:
Also the new hair from the PoP sets look like a great addition. I may have left out a few. You have the mold, now just make different colors and offer them more widely. I also refrained from requesting new molds at this time.