This is Robottillo:bit, a case for a BBC Microbit which looks like a small robot.
I made two versions, the first one with a rear protective cover, the second one with a perforated cover for the pins P0, P1, P2, VCC, GND.
You can lock it on a base that contains batteries.
To make Robotillo:bit I was inspired by MicroBot.
More detailed can be found on this link: http://www.maffucci.it