Hmm, this is kinda personal ;-) I have my avatar on my chest ... its a catch-all symbol for intellectual illumination, which includes atheism. I also have some old English letters on my arm near the shoulder that say, Illuminatio Ubique, which means "Illumination Everywhere".
This is what I ended up getting. It is the A made with a pattern of shaded green leaves. And I am not normally as sassy as in the picture. I had just gotten the tattoo in Vegas and on that same trip ran into an obnoxious religious demonstration. I like it because not many know what it means, but I do! And I know what it means to me.
Nice place to take a picture. *laughs*
I was thinking about getting Darwin's Tree of Life on my forearm.