I noticed that the site allows you to upload any single image into the skin template, which it then places inside it's cutout template pieces as one whole unit. I would imagine if one wished to get more creative with customizing the skin pieces, it would be pretty easy to screen capture that template and bring it into a program like Photoshop. Then, by overlaying the desired separate images onto the cutout areas and saving that combination file as a new single .jpg image, this new image could be uploaded and used. Might take a little experimenting to get things positioned right, but would make for a nice little project.