I really like tinkeringtech's enclosure for PocketBeagle and made a couple revisions. There's a cutout for the CPU in the bot.
A portable project case that you can put in your bag and take with you.
Aluminum case for BeagleBone Black on sale from Adafruit
BeagleBone Black Heatsink Enclosure
Clear plastic BeagleBone Black enclosure available from Sparkfun.
keep those birdies safe
Unibody Aluminum Case for BeagleBone Black being sold by Adafruit
DIN Rail mounting enclosure for BeagleBone Black
Enclosure for BeagleBone Black