This repository offers a GIMP plugin that generates images with stable-diffusion:
The plugin uses StableHorde as its backend. StableHorde is a cluster of stable-diffusion servers run by volunteers.
Download the plugin for Gimp-3.
Head to Gimp3 instructions or Gimp2.10.X instructions.
You can join Discord, to find someone to help you using StableHorde or the plugin itself. Have fun with your prompts and the results from thousands of years of experiences and thoughts.