Dynamic Prompts + Outpainting. Workflow is set to only currently outpaint left and up but you can change bypass on the groups to go with down and right too. Outer bypass groups are for using controlnet on the outpainted images. I don't do that frequently since I run out of vrarm too quidly on my machine, but if you have more vram than I do give it a shot.  Prompts are a bunch of prompts collected or created over the last few months from various locations. It also includes a few public domain books in the mix...

I edted the text files with  https://codebeautify.org/remove-line-breaks#  to remove the line brakes, then  https://texttools.org/add-line-breaks  to add line breaks back in after period and finally  https://textcleaner.net/  to remove punctuation and special characters as comfyui kept crashing when it'd hit certain special characters in the prompt text files... It's not perfect but give syou a heck of a lot of variety, and you can play around with it to get your own results.

Currently I'm mainly making outpaint to the left and up since I think it makes most sense for logical graphic design elements if you want text added on top of the image... I still don't have outpainting figured out completely but this foocus outpainting hack to allow sdxl type rendering in outpainting makes a lot more possible than when we had to use sd1.5 only to outpaint... I probably overload the negatives but leave it like that just in case.  You cna probably cut out about 3/4 of them, lol... When I use the tagger it seems to pull in pokemon for animals no matter what you set negative prompt or exclude tags too.  

Have fun! :)