Here is a simple enclosure for a LinkM USB-to-I2C adapter for programming BlinkMs. ( http://linkm.thingm.com/ ) Normally LinkM comes with an enclosure, but if you want to make a custom one for yourself, you can use this as a template.
The enclosure is made so it will snap together and not need glue. (Though adding a dab of glue once assembled will make a strong fit)
The basic form of this enclosure will likely work for other USB "fob" sized devices. Make custom enclosures for your USB thumb drives!
Print out one each of the top and bottom pieces.
Insert LinkM into bottom piece.
Snap on top piece.