Style transfer can automatically transform photos
Using Neural Artistic Style Transfer (Gatys, et al. 2015) I was able to transfer the artistic style of different painting onto my cat.
Neural Artistic Style Transfer uses a VGG-19 pretrained on ImageNet. The style of an image is captured by the activations it generates in the VGG-19. Then the content image is iteratively changed to match its style to the style image.
I wrote an article on how style transfer works and my results on Medium.