We have some further detail on which hair/skin colors will result in which forms for the druids in the upcoming patch. With the possible exception of the change to shaman totems, this is really the 3.2 change that I am most looking forward to. This change is completely full of win on an epic scale.
The source of this information is EpicWins.com. You can check the link there for information on where to find your nearest barbers to getting the job done.
Also, here are some links to the image charts you can use to determine which changes you need to make for the form that best suits your taste. Clicking the image will direct you back to EpicWins’s website.
[EDIT: Alright, EpicWins.com took down their pictures and deleted the post that they were in as well as everything else Warcraft related. As such, I've looked for some other pictures to use here instead. These I'm borrowing from MMO-Champion instead. The small images here I host in my photo-bucket account, but clicking them will link you to MMO Champ instead.]