Hmmm the NES case it kinda cool, but I bet someone could go further charge 50 a case for some cool fun ones like a skull or Xbox original or more decorative stuff
All the different game systems, castle grey skull, the eye of thindera, ohhhh a Simon Says, or Etchasketch, hmmm The Simon says could even be functional with a Pi zero when it's not plugged in, and a full gaming setup when plugged in...
@Psionic Roshambo, A 3d printer is not capable of replicating the authenticity of a dollar bill. Only way to make money is by printing them out on a sheet of newspaper.