@MadScientist: The straight shot didn't work for me. For one thing, it was taken on a cloudy day and the contrast was too low. I had just downloaded the Nikon Color Efex filters for Photoshop and tried them out on this image. This effect was produced by the filter called "old color." Some of the B&W/paper toned filters weren't bad either, but I liked this one the best. It's interesting to see how clearly separated red, green, and blue curves are in the histogram.