This is basically what I did! A modified version of a random walk to generate "invaders" with a gradient color. You definitely get some interesting shapes.

https://tinyurl.com/creagen-invader (best on desktop)

Sorry for using an url minifier the original url is too long. I'm using a custom web editor I built for generating this. Still working on shorter urls for it.

This and including muffinmans solution was part of a coding challenge for Creative Coding Amsterdam, for anyone interested and in the area definitely check it out https://cca.codes