For those of you who have developed a curiosity of those amazing 3d printed lithopanes there is a cool online website tool that makes it easy.
Head on over to Image to Lithopane and get started. They have a very simple web based tool where you can upload an image and have it processed into a variety of types of Lithopane styles and shapes.
Their online web based tool
Head on over to http://3dp.rocks/lithophane/ to try it out for yourself