This was taken in my backyard.
Using Photoshop CS3:
a) I duplicated the background layer
b) Set the blend mode to multiply
c) Masked out the flower - so only the background was darkened. Multiply will reduce exposure by 1-stop.
d) Duplicated the layer
e) Masked the flower only
f) Set the blend mode to color
g) Applied USM to the hole thing.