Here you can read about two effective pick up lines by Michelle Wild.
-Go up to her and just say this: Nice to see you again.
Try it next time you are walking through a crowd. Don't even wait for a response, and it will drive them crazy and causes them to seek you out.
-If you're consistent and
persistent with this strategy, this could yield you a lot of beautiful women.
It'll take a long time though, but then again, it requires almost no effort
on your part:)
Here's what you do. You see a girl you like, but for some reason can't do
an approach (you don't have the time, or maybe the guts, or the situation
disallows it etc), at least do this - say "Hi". Keep enough eye-contact
to get a confused "Hi" in return, then continue with what you were
doing (walking, working etc). Maybe you'll never see her again. But if you
do (oh joy and behold!:) - say "Hi" again. Then continue with what
you were doing (basically, ignoring her:). And so on, and so on. After the
first three "Hi's" the girl is still wondering, if or how she is
supposed to know you. After the fifth "Hi" she is already wondering,
how come you never actually talk to her. After the tenth "Hi" she
can't understand, how come you never even approach her. After the twentieth
"Hi" she is so confused and intrigued about you that she just can't
stand it anymore and will approach YOU instead. She'll try to find out how
the two of you know, and why you never talk to her, or why you never even
approach her, but you still keep saying "Hi", is there something
wrong with her etc - be very vague and mysterious about it in your answers
(after all, you don't have much to tell anyway:). Now however, you're talking
to an absolutely gorgeous girl (remember, you almost didn't even have the
guts to say "Hi" to her:), who is so intrigued about you the she
approached you - make the best of it:) - seduction tip.