Nicki suggested my sunflower photo might lend itself to Topaz Adjust, and this is something I've thought about trying for awhile. I finally downloaded the 30-day free trial, and played with it a little with this photo. This particular adjustment is "dramatic". I tried the HDR adjustment, and thought I liked my own version better, but I don't know how to work with all the sliders in the program yet. I also liked the "ghostly" version, but it definitely results in a creepy, Stephen-King-like vampire sunflower field! The painting adjustments were also fun to play with.
Thanks, Nicki! I think I'm going to enjoy playing around with Topaz Adjust!