This is fascinating and frightening at the same time but here is the answer to your texture needs (Licence seems to check out on first glance too) and it's already a plugin for blender. Stable Diffusion generates pictures based on a text string, in my quest to obtain buildings and windows I've turned to AI... here is the result from the text string "restaurant windows 2d night time"
"busy shops exterior 2d daytime"
Head over to https://huggingface.co/spaces/stability ... -diffusion and try it out - the more detail you provide in the string the more accurate the AI images will be. Now for the frightening bit, here's the result from the string "People Playing Flightgear flight simulator on an old computer"
How about this classic?
And this, ladies and gentlemen is how AI currently sees the flightgear community... (be afraid! hahaha)