I gathered images of abstract paintings from WikiArt.org, processed them, and fed them into StyleGAN2 ADA at the size of 1024x1024. I first trained the GAN using landscape photos for four days. Next, I trained the GAN for four days using abstract paintings. I then processed the output images by adjusting the aspect ratio.
You can read more in my article on Medium here: https://towardsdatascience.com/creating-abstract-art-with-stylegan2-ada-ea3676396ffb