A simple case for the Raspberry Pi model B computer. It's held together with stylish rubber bands and has removable pieces to cover up the ports you're not using.
This comes in four parts which should all print without support. You'll want to make sure there is absolutely no warping (otherwise it won't fit your Raspberry Pi properly), so be sure to let the parts cool COMPLETELY before you take them off the build plate. It's much easier if you're using ABS rather than PLA.
I've included an all-in-one version for Replicator users, which includes an apron around the parts for extra protection against warping (which needs to be removed with a sharp knife after printing). Otherwise, you'll want to get the four separate parts.