AI generated art. To make something like this you need stable diffusion (either running locally if you have a good GPU, or a website that will let you use it).

In stable diffusion there are plugins called control net, where you can add details you want in the final image. Usually people use it to force specific poses or scene arrangement, but you can also use it to make sure that the final image has a clear pattern in it such as words or a geometric pattern. A recent popular example was a town with a clear spiral effect.