Hello @Barry_De_Beer !
Thanks for discovering me Alchemy, I didn’t know about it and seems pretty awesome for concept art. I’ve been testing it a bit and it does some pretty unique things with the “affect” modificators. Imitate their behavior in krita would be hard, but not the end result.
About auto generating random thumbnails, is something I’ve considered and I’m very interested.
I did a script once for automatically do some brush strokes in a Krita document, and if I recall correctly, its performance wasn’t the best (even though it made more things than painting, so maybe I could check it again).
Another way could be to modify directly the layer/image pixel per pixel. I did something similar in my pixel art plugin, even though it was meant for pixel art (small canvases with not so many pixels), so I would have to test its performance.
TLDR; is doable to auto generate thumbnails. I think the thing that kinda “pulls me back” for adding it is that I’m not optimistic about the generated images. Maybe they are so bad that made me rename the plugin to “Crappy Thumbnail Generator” haha.
I personally feel that having the Select Random Brush in a shortcut, and quickly spam it and painting randomly in a thumbnail with some “purppose” would be more effective for creating a random base to work with.
But again, is something that I have in mind and I may add it in the future, even if is just for the fun 