Original image courtesy of Flickr User
The Oilpaint effect that ships with the free Pixel Bender plugin for Photoshop CS5 allows users to transform their photographs into images with the visual appearance of oil paintings. With a few simple sliders, users can adjust the amount of stylization, brush-size, brush-scale and other parameters. Thanks to the GPU support that is part of the Pixel Bender technology, these adjustments happen lightning fast on GPU enabled computers.
Here are some links and videos about this feature: