You can do really neat things with a $1-2 “Color Optical Lens” toy camera. I had heard that, even seen evidence, but doing it myself really showed me there’s no need to buy a Holga when you can do the same thing with $2 rolls of 35mm film and a thrift store camera. Check out these light leaks!
Kodak Motormatic 35
Above left: Craig F. Walker, two-time Pulitzer Prize-winning Denver Post photographer; above right: A view of the Kodak Motormatic 35 camera.