MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I'm successfully using https://3dthis.com/litho.htm to print lampshades and spherical lamps like earth or moon.
Feel free to use http://3dp.rocks/lithophane/ to generate lithophanes from your photos
I made it for my daughter, but let me know how you get on with it.