Catching up with the New Aestheticists and Mr Barnes kindly introduced me to Rainer Kohlberger's brilliant pxl app. There are other things that achieve similar effects, like Poly and Dmesh. With Poly you have to do some actual real work (although not much and it's fun); I'm going to try out Dmesh next. But pxl stands out because you can export your auto-processed artwork as a vectorised pdf file, which makes the results much more useful.
It's effortless, which reduces the perceived value of the outcomes, but the results are, as you can see, great.