I have been experimenting with filter() to blur and posterize in Processing, and Random bezier blur & posterize is the result. Above are a few stills (click to enlarge), but it works best in motion. Here’s a short movie of the results (824 KB .mov). If you let it go for a while, it makes for a soothing light show. It runs as a Java applet here, but you can download the source code to save image sequences or rework.