Create interesting wallpaper by using outpainting to add the environment around the character. Then it progressively increase the resolution in multiple stage to add more details and make the composition blend together.

There are multiple prompt to adjust each stage. It should work with any SD SDXL Pony ect.. By default my settings use a SD 1.5 for the stages then it Switch to a Pony for the two final stages.

There is a saving node for each stage. And the option to save the final with Civitai meta daya or in 4k/8k in webp with workflow.

It use a couple of custom nodes so it might be a good idea to get ComfyUI Manager to install the missing node.
https://github.com/ltdrdata/ComfyUI-Manager

Generating all the stage take about 80 sec on a 7900xt with the current setting.