Years ago (we’re talking decades) I ran into a small program that randomly generated raytraced images (think transparent orbs, lens flares, reflection etc), suitable for saving as wallpapers. It was a C/C++ program that ran on Linux. I’ve long since lost the name and the source code, and I wonder if there’s anything like that out there now?
Could it perhaps have been Bryce 3D?
No, this was (from memory) a console application only. You specified output size, maybe a couple seed values, and the process after that was random.