Features:
- 3D-printed by Shapeways;
- snap-fit fixing system for the board, easy to mount/unmount;
- snap-fit closing system, no screw required;
- bottom holes for blocking the computer by screws (sliding mount);
- led lightguides (available as separate part);
- pre-shaped hole for GPIO access: just cut it out to open.
- different colours available
The model has been tested on real boards and fits very well.
It is available on Shapeways at the following links.
The case: http://www.shapeways.com/model/486999
The LED lightguides: http://www.shapeways.com/model/486757
More info on my blog.


Other photos on the gallery.