This one isn’t mine but if you want to make your own they’re made with stable diffusion and controlnet. If you’ve seen the “renaissance village spiral” image that’s been all over the internet for a week it’s the same thing.

Edit: hn and reddit discussions with links here:

https://news.ycombinator.com/item?id=36832271

https://www.reddit.com/r/StableDiffusion/comments/1561k15/free_tool_to_generate_hidden_text_using_stable/