[Cognitron]

I think most of us are pretty new to it since they just opened the beta to a ton of people. I haven't tried to do anything like that with it though. All I can say is it tends to take a lot of experimentation to get what you want. And you'll probably have to do some work to the images to get them to tile seamlessly. If you can't get the pixelated look quite how you want it, you might try using it to generate a base image and then use a separate tool to pixelate it. Some people are using it as part of a larger pipeline.

The discord is full of people sharing their experiments and approaches though. Maybe try asking in the prompt-craft channel to see if someone else has attempted something similar.

Good luck!