Exploring the CS5 toolbox is interesting. In 99.8% of my work I wouldn't never use the Art History Brush tool, but now that I have tried it on a rather doll photo, I might find other focus arreas for this tool.
Here is the original photo - nothing special. I use Content Aware fill to remove some objects.
And here is the same photo transformed by the Art History Tool. Remember to convert the photo to 8-bit or otherwise the tool won't work.