I am one that believes you should get a tattoo that means something otherwise you are going to regret getting it. Don't go get something because it looks cool.
This is probably the best advice you'll ever read when thinking about a tattoo.
I'm 20...when I think back 10 years, I was interested in so many things that I just don't care about anymore. I assume it'll be the same in 10 years time! I'm going to be covered in tattoos, I know this. I only have 3 at the moment, but they're all things I've got whilst with mates. You go out for the day, someone says "Oh, let's get a tattoo", walk in and pick something from the wall, get it done...that's it. No thought, no effort...no meaning.
I wouldn't say I regret the tattoos, because I think they look alright...but I think in 10 years time I'll look back and think "What an idiot". So I'm designing my sleeve myself, and it's looking completely personal, with memories and attachments all incorporated into it. Much better than something you've picked off a wall, right?