It gets a little trickier if you’re not happy with the default look. You’d have to make the motext editable, make the resulting extrude objects editable, and then connect them into a single object. Then you can manually adjust the extrusion and the polygon selection for the white material.
If you go that way you can put the resulting object inside of a mograph fracture object (set to explode and connect) and apply the random effector to the fracture.