gman, nobody actually tries thes out. they're just funny lines that you bet your friend five bucks to go say to that hot girl over there, and then watch how it plays out. they're just to be funny
Most pick up lines don't work. Or at least they won't work with someone who has any self respect or self confidence. And do you really want a needy girl (Needy as in needing assurance shes pretty, you really like her, etc., etc.)
The best pick up line goes like- "Hey, I'm _____. I saw you, and I wanted to talk to you/ think your really beautiful/ wanted to meet you."
if u were really serious,say something about how they have great eyes. BostonXBound may correct me if im wrong, but doesn't that work to some extent as long as its not too cheesey?
As long as your not handing out complements like candy on Halloween, and your not overly cheesy (sometimes it can be cute, try to figure out if she would be interested) it will probably work.
Eyes, hair, lips, skin, anything a girl could be not confident about, you compliment. It makes us feel good. And that's good for you!