three Trees, three Lightpoles

If you use a Holga in its out of the box configuration, it will give you a 6 x 4.5 photo as above. Most people, myself included just toss the masking frame away and shoot 6 x 6.
With 6 x 4.5 you get 16 shots per roll and at 6 x 6 you get 12 shots.
Sometimes I like to use the camera the way it came...it's kind of a going back to the beginning feeling for me which I like a lot. And shooting in a rectangular format makes you think a bit more on composition since it's either landscape or not landscape.