I've seen about a dozen colors of Brownie Hawkeye Flash (all were originally either dark brown or black Bakelite). Nothing says something similar couldn't be done to a cardboard box camera; seems especially apt if the original "leatherette" is mostly gone anyway.
It's also fairly common among those who actually use cameras like this to glue on a piece of board with a blind nut in it to serve as a tripod socket, to add a filter ring in front of the lens (or the opening in the front plate, anyway), or to cobble up a way to use a cable release.