Segment from Film Photography Podcast Episode 28 - February 15, 2011
"Sprocket hole photography is a style of photography that exposes the full width of 35 mm film, creating a photograph punctuated by the "sprocket holes" (perforations) along the edges of the film. It is part of the lo-fi photography movement. Usually, this style involves the use of a modified medium format camera, since a 35 mm camera ordinarily will not expose the edges of the film."
Sprocket Hole adapters (35mm to 120, 620 and other formats) can be purchased from Sprocket Hole Revolution.
FPP Listener Rob says -- Follow these instructions to do it yourself.