Sunflare.  It's a special kind of backlighting that happens when you put your subject inbetween the sun and your camera. It usually happens in the late afternoon (except for you odd early birds among us!), and the results range from colors that look like the lemonade of late summer, to wild lens flare, to silhouetted backlight.

The general idea is to face your camera west at sunset, and put your subject somewhere between you and the sun.

Keep the sun JUST slightly out of the frame, and here's what you get.