The Scribbler takes simple vector based input and creates its own drawing on top of it based on a number of simple rules. When a new scribble line is created it chooses a few numbers at random that eventually determine what sort of line it will draw.
As it begins to draw it fine tunes those values to the type of drawing that you've made. Because there is randomness built into the program, each scribble is unique.
The Generator made this extraordinary beautiful picture (and no, it's not a self portrait):
[ Scribbler Illustration Generator ]