Videos of the two animatedPaint pictures exhibited at the Context Gallery. They're a bit big, 13.2Mb and 17.5 Mb respectively.
Here are some of very early essays into animatedPaint made in 1987 using Hypercard.
Here is the very earliest essay into anymatedPaint made in 1987 using Hypercard. It illustrates the idea of the paint following the path of the brushstroke and accommodating itself to the width of a stroke.