I suggest asking the fine folks over in Thirty-Seven's The Costume (Re-)Design Thread thread. Some pretty talanted costumers in there, and they might come up with something you like. 
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Biggest Troll on the forums? I'll give you a hint:
Titan horns, the winged Valkyrie shoulders, Witch Wing gloves and boots, bat wings. If it's a girl.
Not sure what pointy bits are available to make a unique outline for guys, but I'd go huge, even if you're shrinking him down to a near normal physique.
Or whatever. 
So, I rolled my first Illusion Controller, and I'm struggling with the character's blah look under superior invisibility. I know that Auras can offer some more visible distinctions post 30, but I'm looking for something to make my character's look pop a little more.
Any suggestions? Costume pieces? Colors?