There's a minor bug in the game at the moment which can nonetheless confuse your enemies and teammates.
What you need:
Balance Spec
Resto Spec
(Can be main or off spec, doesn't matter. Just have these two learned.)
What you want to do:
Learn and use the Glyph of Stars which makes you appear in Astral form Glyph of Stars - Item - World of Warcraft
Right, so?
Well, what you do is sign up for a Battleground or Skirmish when you have Balance spec active + glyph on -but you sign up as a resto/healer!-
You will then join your fight appearing in astral form even though you are now a healer without even being able to use that glyph.
Your enemy in a BG will think you're a DPS class. Besides, it's pretty funny imo.
Pic4Proof
http://imgur.com/Nd3hzmm