@RedDiamond

Yep I use the fabulous free Online & very easy Gaugan 2 (from NVidia Lab)! :) http://gaugan.org/gaugan2/
Any headaches! :)
A very detailed process is here (sorry in French) ;) (you can use any translaters)
https://moiscript.weebly.com/gaugan.html

In resume you can use any image PNG or JPG but prefer PNG because you have "solid" colors
and especially the 32 colors of Gaugan for a more precise control of materials!

You can draw directly with some primitive tools or even your own fingers!!!
Or more easily and speedy with some images yet created!

I use the very funny free MagicaVoxel http://ephtracy.github.io/index.html?page=mv_main
or the free Online Vervette https://moiscript.weebly.com/vervette.html
for create any start PNG image!
But you can use your favorite prog for create a 2D start image!

Have fun!
here 2 seconds fingers! :)


Here a pure Moi Objects jpg image (on the left) can give you terrific variations (on the right) ! :)
So of course an infinite worlds to explore!


And if you take the 2 images above (Moi + result) + any text you will obtain an infinite fractal result!
here with "Tropical beach" as text :)


or "green vegetation" as text...etc...


and all that in less of 3 Seconds!