How girls show signs of friendship vs. attraction?

This goes to the girls out there...

I'm not a big fan of becoming friends with girls that I'm attracted to. I usually show my intent and go from there. If they don't reciprocate, then I move on. Not a big deal. But...

What about reading "signs" from friends of mine that are girls. Sometimes I wonder if I should give the girls that are around me on a daily basis more of a chance.

SO the question is what are specific kind of "signs" that you give to your friend when you realize that you want to be more then just friends and did they work?
How girls show signs of friendship vs. attraction?
Post Opinion