Here are some brushes I used in this video. Some are based on a very simple scatter and others are just variations of what was explained. Just changing the scales of the shape can give very different results with the same controller setup!
The exception is the 'Circuit' brush which contains some crazy (and very probably useless) maths. This was a completely failed experiment that happened to look cool
What's great with the controllers is that you sometimes invent effects by accident.
Feel free to modify and experiment from these files!