I’ve always enjoyed playing around with Holga and pinhole cameras. A while back I made my own pinhole using a T2 mount, baked bean can, Coke can and a washer. It was fun but the images weren’t what I wanted, so I’ve bought an pinhole adapter for the T2 mount from Pinhole Solutions, it has a working aperture of about f/180. This is a test photo of my cottage:
