I recommend using th width equals to the height to better results, e.g. 1024x1024.
it will work with almost everything, just try some times(it took me a lot of time to generate the samples)
Trained on WAI-NSFW-illustrious-SDXL, so it work better there, but should be usable with all Illustrious models.
a model trained to generate "things" as cubes.
TEST VERSION, you may need some retries to get what you want.