Untitled Micro Click image by Simon Tomlinson
There is a cool technique that can be done with a Holga similar to a panorama. But, rather than trying to line up the image edges, they are purposefully overlapped. Usually 7-8 images make up a 180° image. What you get is more of a wide angle effect, rather than a panorama.
Here is a link to a guide on how to shoot one yourself. The rest of the site has some other great tips and advice on Holgas.