See https://github.com/fastai/fastai/issues/1687 for detail discussion.
If you have worked with matlab or openCV, I surly think you will remember lenna.png. It is an ubiquitous test image thats embedded in the library, and you can invoke it without any network or external disk dependency.
I am proposing adding such an image to the library. This will be helpful in reproducing and highlighting data augmentation transform bug. So it may be a narrower use case.
Just putting it here to get more general feedback.