Lexica
Lexica: It is a search engine for images generated with Stable Diffusion, and it also has an option to generate them. Very good resource when you are looking for images already created with a kind of Google of AI images.
ai tools design
Playground
Playground: This is an interesting tool as it is a prompt finder for generating images in art creation tools. You have a page full of images that are results, and when you click on one you will see the notice that was used to generate it.