Not to be so boring and conservative, but really, what is the point of having a tattoo? I see people with their name and birth year and such tattooed...like, did you do this in case you forget your name or get killed and require identification?
Now, your response will be, "Well, that's stupid, I'm doing something original that represents me."
You're a representation of yourself. Do you need a tattoo to remind you of who you are? Do you need a tattoo to show others who you are? Is that like the "About Me" on myspace that you fill out trying to describe yourself and who you are?