First - WoW Exploit Community 2012 recommendations!
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Go to a barber and join a queue for a battleground using the new “Join from anywhere” battleground feature in the pvp tab. Sit in the barber chair and choose a style and colour etc, when you are done wait for the battleground to come up and enter the battle. Your hairstyle stays at the last one you had when you pressed the enter battle button.
I found this out while just trying a few new haircuts, got fed up so entered the battleground that popped up, just happened to be a crappy haircut and nasty colour, had to hit stealth and hide in a corner