Focused on a blooming Common Milkweed about 3 feet away while shooting through a group of Black Eyed Susans close to the front of the lens. The Susans provide a yellow gauze-like effect. Shooting through man made fog?
I forgot to mention this requires a wide open lens, otherwise the forground objects are too opaque.
Well, I stuck to my vow to avoid shooting dahlias - but I was tempted.