i made my own camera obscura by simple using a Pringle tube. i placed tracing paper on one end and tin foil on the other side. Then i made a aperture by using a pin and poking a hole in the end. 
here are some pictures i took using my camera obscura. 

We converted the collage dark room into a camera obscura. We simply covered the dark room window with a piece of black material and cut a small hole for the aperture. This allowed the light to come through the aperture allowing the image to be projected into the room. by using light sensitive paper we captured the image that was projected back to front and upside down. This then a negative which we were able to develops in the dark room.