Thanks to Brian Enigma who posted the OpenSCAD File to his Mario Questionbox (http://netninja.com/fun/mariobox/). I was able to modify it and add a thin filling for the questionmark.
Size is 10x10x10cm
Put a LED light into it and close the lamp with the top cover.
I used a 9V battery block with a handfull of LEDs.
box.stl | 866.6KB | |
cover.stl | 13.6KB | |
cube.scad | 3.9KB |