I don't know, really. I feel like an emerald green matches my personality, but a piercing ocean blue would be a great one to kind of compliment me. And then there's a golden aura that I feel would be fitting for fairy appearance, given as how I'd value it so highly.
Not to be undecided, but I think my fairy would actually change colors based on my inner state of being. Complacency and overall general state would be ocean blue, serious thought/interest/interaction would be emerald green, and extreme altruistic tendency would be golden yellow.