I've never made a camera before. But I always wanted to. And for my Middle School students I decided to offer a pinhole camera making class. After some research I found plans for a reusable cardboard 35mm pinhole from Francesco Caponi.  I made my version to test it. Looks like this:

It is a box and a hole in it. Held together with rubber bands. I didn't have many expectations and went through the roll of BW film in three days, trying different exposures provided with the plans. 

Here are the results:

For indoor portraits people had to sit still for 27 seconds!