As a man with quite a few tattoos, I should caution you about getting something you may regret. Not to say you will regret this, though. Just be sure to think it through, first. Out of the 12 I have, I only regret one. Just because you don't eat meat/meat products for several years, doesn't mean you should get a tattoo that says "vegan," because if you DO start eating meat again, you'll feel like an ass.
Anyway, I have a tattoo of a zombie Hello Kitty. I also have a tattoo of a smiley face. But they both have meaning to me. Just make sure that you'll love the tattoo you get, and make SURE you really want it.
With that being said, I want to get a tattoo of Vault Boy from the fallout games. And possibly Pinkie Pie's cutie mark.