Elliott from Makible http://makibox.com/ wrote on The Verge forums that he's interested in writing a WP8 app to control a 3D printer to make a shell for the Lumia 820.
http://www.theverge.com/2013/1/24/3909426/nokia-3d-printing-lumia-820-hands-on#140075707
It would be a fun experiment to use an 820 to start the process of making a case for itself Smiley