This opener I have been using has been a killer. I sent this out to fifteen girls and so far have gotten fifteen responses and n-closed four of them so far.
I send them a message titled "Do not open this : )"
then the message reads
"Ok now that you didn't listen to me already : P this is going to sound super weird but I saw your picture and just had to say that your hair looks phenomenal"
It works very well for me since I have long hair it gives her something to comment back to me about rather than just a thank you.