Gatsu made a unique DIY Bus Pirate case for a v2go:

Here is something I cooked up a while as a case for my BP v2.go.  Its a DV tape case.  The inside is  46mm x 68mm so it would fit a v3 as well.

The board is fixed to the bottom with a double layer of double sided tape.  The cut outs were just done with a scalpel as the material is quite soft.

Thanks for the tip! Via the forum.