There is an interesting article in Christian History that I've had saved for a long time. It is called "Tattoos of the Cross" by Jennifer A. Johnson, and highlights the place of tattoos throughout the history of Christianity, especially among the Coptics of Egypt. It's not too long and well worth a read.
I also found "Tattoo And The Bible" at Sacred Ink a fairly informative piece.
I have no desire to get a tattoo, and don't really feel one way or the other about people who have them. I suppose if I were to get one it might look something like the one pictured. Or maybe "return to sender"... or "save"... or... I dunno, I would always be afraid I would later regret whatever I got. They're not quite as easy to remove as blog posts. So... Tattoo you.