As a digital abstract artist who also does generative art, I find making the tiny images sort of funny. How about making a 30x30 inch painting? If it takes 1 second to make a tiny 250 pixel image how long would it take your system to make a 9000x9000 image?
Certainly a good point. Unfortunately, the output size is constrained by the training data (which in this case was ~800x800px). I think it would be kind of a pain to find 14,000 9000x9000 images, though, so I don't know if this will ever be able to fulfill this requirement. ;)