Lomography

The Holga is a 120 film toy camera that produces colourful, sometimes vignetted photos and is used in the field of LOMO photography otherwise known as lomography. There are different models of Holga cameras.

the lomography.com site has thousands of examples of lomographic photos such as this one :

there's lomographic exhibitions too which feature lomowalls

http://en.wikipedia.org/wiki/Lomography
http://en.wikipedia.org/wiki/Holga
http://goholga.com - modifications for the Holga camera
http://www.lomography.com.au - Australian lomography site
http://www.lomography.com - International lomography site