Check out this awesome ceramic pinhole camera created by Steve Irvine.
“It is made of stoneware, fired to 1,300 degrees C. (2,350 F.) It has a matte black glaze on the inside. Overall, it measures h 22.5 x w 20 x 20.5 cm. on the outside. It’s designed to take a 4 x 5 inch piece of photo paper. The negative holder on the inside is made from three strips of black weather stripping.”
Heres the example shot.