I've been helping out with the Ripple blog all summer, which is starting to wind up shop for the winter. Ripple encourages artists to offer their lovely artwork for a $10 donation to help the animals affected by the Gulf oil spill. They've raised well over $10,000 so far through the generosity of many, many people.
I just happened across the artwork above, "Oiled Scarlet Ibis" by Lindsey Carr, which wasn't created for Ripple but is such a beautiful example of the theme I had to post it. If you look closely at the horizon, you can see an oil rig with its shadow drawn into the foreground.