I think it may be more legible for information visualization to utilize a rougher specification for color and other element aspects. In this implementation, perturbations of color and line thickness provide a less uniform set of squares, but they are still nearly the same color. Perturbations of color, size, and line can all provide not only a nuanced aesthetic, but perhaps also convey a certain uncertainty in the data visualization. Using rgb specification, you imply a sort of precision similar to decimal precision in spatial coordinates, and by wiring your visualization to produce a slightly rougher color spectrum on output, you might correct for that. While line jitter has been a feature of drawing packages for some time, I haven't seen procedural application of this kind of perturbation to traditional data visualization.
I'm going to add some perturbation of paths following the same concept. I'll also put a few buttons in for user interaction.