It looks like you also have one next to your post, I got the same as SilverVixen, surprisingly.
Something to keep in mind is that there are different types of auras. SilverV and I saw blueish-green(I saw more green then blue), but someone else(my fiance, for example) may see something different.
I don't know about SilverV, but I see what I call a "Spiritual" or "Alignment" aura. Green generally means you have good intentions, more green then blue means more good then bad, an equal mix of green and blue would generally mean confusion, more blue then green means more bad then good, blue alone means bad intentions.
A red aura is plain evil. So far I have only seen a red aura when someone was being affected by a Demon and that is why I don't trust Demons, as I have said so many times before I have yet to meet a good one.
A gold aura, which is extremely rare, has only been seen by me when someone is being affected by Angels and that is why I do trust Angels. I have yet to meet a bad one.
Another thing to keep in mind is that "evil" is a perception, what I perceive to be evil is based on intentions. If you intend to do something that would hurt someone in any way at all(emotionally, mentally, physically, etc), you do not care about the results of hurting them, and you do not have to do it, then that is evil. Good intentions would be the opposite, sometimes even putting yourself at risk for the sake of saving people from injury.
actually Rag, normally I see numbers....haven't quite figured it out why yet, but it switches from colors to numbers and back again depending on what i'm asked to see and what i'm supposed to see. For me, blue usually means a clearing mind, or a mind that is calm and clear and a person who can see the truth in things, where as green for me usually means someone who is smart, cunning, with the potential of becoming a very wise being. There was some purple also in your aura Firecharm, it was a bit speckled, and my interp on that one is that it's usually a sign of some sort of psychic ability, clairvoyance or something of the like, but because it's speckeled and not thick, i'd have to say that it needs development, and that you are just now coming into opening that part of your mind.