This is an addon for openFrameworks (http://openframeworks.cc) based on the shaders available in Brad Larson's iOS GPUImage library (https://github.com/BradLarson/GPUImage). I've structured things quite differently, but the majority of the shaders are about the same.

There's a Kuwahara Filter for the kids, Perlin Pixelization for the grownups, and a creepy Bilateral filter for the self-conscious teen in all of us. You might also enjoy the stained glass-looking Voronoi implementation, the retro CGA Color Space filter, or the utilitarian Harris Corner Detection.

Here's a few of the filters in action:

Nothing, really.