This is a derivative work using a fabulous fractal image created by Bunny Clarke. Her work is called Feline Opera have a look.
As soon as I saw her work I immediately thought of cats in overalls, lol, and ask Bunny if I could manipulate it, and she graciously agreed, Thanks Bunny!. I used Photoshop CS6 extended to make the fractal 3D, then I built my cats using the 3D features of the program. Rendering took hours, and I added a slight recoloring in Lightroom.