We've all experienced, getting a girls phone number, texting and not getting a response from them. Over the years I've used a lot of texts to get to text me back but by not using my own material, I became incongruent and came off as weird. IE. If I met someone on a college campus, and had a relaxed personality, texting her, "I just saw a cute fish and thought of you" was not the way to go.
But here are some generic any-personality non-respsonsive text backs.
"Hey did you forget how to use your phone, or you just playing hard to get"
"Are you alive?"
"Omg, that's hilarious?"
"OMG, YOU WOULDN'T BELIEVE WHAT JUST HAPPENED"
This being said, if I don't get a text back after one of these, I just delete her info and move on.