If you want to use AI to generate your own coloring pages, there's a good app for the job: Color Pop. This digital coloring app is designed to be accessible to all ages, with a constantly updated library of more than 600 illustrations. With AI, you can create your own coloring pages, and you can customize them with digital pens, brushes, spray tools, textures and more than 1,000 effects. The app also includes community-submitted illustrations that you can browse and color to your heart's content, with subjects ranging from anime characters to animals. It works on mobile devices and the web, and a free version is available for casual dabblers.
Another option is Imajinn. Although it's a more general-purpose tool with a variety of AI-powered image generation services, its website can be set up to create your own artistic creations, including coloring pages. Although its main business is other uses like personalized children's books and product photo visualization, it uses AI to turn uploaded images into art in a matter of seconds. If you want a tool that can handle other creative tasks besides coloring pages, this could be a good option.