I've seen many really cool tattoos, but I don't think I've ever seen one where I went: "I want that too!".
Like Imperfectionist, I'm probably too indecisive to get one. I am fascinated by them, though.
EDIT: I have to say, though, that Asian buddhistic tattoos are gorgeous, like e.g. from Thailand, Laos and Cambodia. But really, all authentic tribal tattoos are great - watch Tattoo Hunter on Discovery and you'll see what I mean. Some of the stuff he gets done on that show is so beautiful.