Fun with Lithophanes. Made using this lithophane generator> http://3dp.rocks/lithophane/
Top: A family lunch. Printed out at 136mm wide without it warping.
Middle: A challenge to put Brad Pitt on a shot glass produced this (using 123Design). It's only a prototype - I made a bigger one as a gift. I am thinking of making similar ones out of the food safe PETT T-Glase I've found on Amazon.
Bottom: Not only is it dual colour but it's also glow in the dark! I am thinking of constructing a lamp shade with this style of design.