That's one of the things that excites me the most. I know a lot of street photographers like to play with lights, shadows, leading lines and stuff like that (No wonder No. 10 is your favorite photo :D). For now, I'm sticking to the basics.
It would be cool if people who are photographed stumbled upon a photo eventually (and hopefully want it printed or something instead of taken down :D). Who knows, life works in mysterious ways. You can see one of them is recognized even in this post!