I wasn't entirely happy with the way Pony XL generated soccer balls so I spent a few hours throwing together a LoRA for them. It still doesn't seem to generate them right consistently but quality does seem to be better than before.
Since the model's only trained on regular black-and-white soccer balls you can also give the LoRA a strong negative weight to get colorful irregular soccer balls.
If someone sets a good enough bounty I'll try to train a better version lol