I saw a fascinating video on YouTube a few years ago by Tim Hunkin (of Secret Life of Machines), where he uses his home-made Cibachrome camera to shoot ultra-large format film. By ultra-large, I mean poster-sized, and the camera is made out of old road signs. He develops the film positive right in the camera, and within a few minutes he has a very large photograph. Cibachrome was last produced in 2011, and this was Tim's sendoff.

https://youtu.be/5AOlPuTQt-M

Here's the Wikipedia article about it: https://en.wikipedia.org/wiki/Ilfochrome