This is my collection of SD2.1-768 Comfy workflow, if custom nodes are used there will be an article link to list them out, however i try to build them with vanilla features only so you can build on top of them.
TwinAction SD2.1-768
This creates two images by using a feedback loop using the first image using tiled VAE, both go through super upscale 8X using your upscaler.
Description
SD21-768 generation with Lora Loading, 8X upscale.
Second Pass on random seed used latent feedback with adjustable denoise to create the second image which is also then upscaled 8X.