We are still very interested in creating some kind of pinhole camera if it is possible, and so we kept out for different objects which we could turn in to cameras.
An old fridge
Empty water container (small)
Empty water container (large)
Old postbox - this would be perfect apart from it is stuck into the ground, and we could not move it.
Brick 'sculpture'. This reminded us of the unused space in a pinhole camera, and how in other objects, such as this one, this space does not exist.