Approaching strangers and asking to take their picture can be a bit daunting. One impediment is the fear of rejection. And, of course, there will be rejections.
Jai Jaing found this out the hard way. After a painful rejection in his entrepreneurial venture, he read that 'rejection therapy' involved being rejected many times. I guess that the pain should wear off. So Jia started a project, "100 Rejections in 100 Days" and blogged about it. He explains the unexpected results in this 12 minute TED lecture. It is very illuminating, and entertaining.