Picasa has a great feature called Posterize that lets you create the illusion of a silk screened piece of graphic art. I used it here to dress up another one of my less-than-interesting tree photos. I combined it with Boost and Orton-ish to bring out stronger colors.

Monticello tree path final resized 750

Below is the original photo, taken recently on a cloudy, early fall day.

Monticello tree drive original resized 750