Taking photos with the sun behind you can create a well lit subject. But, using backlighting by shooting into the sun can create dramatic and beautiful shots.
Flowers and leaves are translucent and let some light through. This creates a glowing effect.
For this shot I had walked down a slope to get a good angle to shoot these trilliums. I was kneeling down to shoot a single flower when I looked up and behind me and saw this scene. I love the glowing trillium flowers against the dark trees in the background.