Hm, I've been thinking about this.
With Roshar clearly having the form of something rotating, my first thoghts went to images of galaxies, but I think thats a bit too far off.
Storms is more what this book is about, and when googling "Hurricane infrared" one can fine images that kinda have the same look and feel as Roshar, when only taking contoures into account.
With his wifes name being Emily, I would not be surprised if a hurricane Emily was the insporation for the map...
But don't waste too much time googling, I already did that (wasting time) : )
Regards