This is a Digispark bumper for the very successful Kickstarter project..

Sliced with cura 12.11, 50 % infill
Printed on my Ulitmaker

Change the design if you want. Add extra parts or remove the mounting flaps.
Just do what you like. Openscad file included.
I could only test it with my dummy Digispark PCB. Still waiting to receive my pcb's.

update 09-01-2013
Use my new design of the case with cover. http://www.thingiverse.com/thing:41291