Pinhole Camera Solargraphy at Astroengine.

[The] solargraphs are taken by a compact camera film cartridge (plus tiny pinhole) strapped to an inanimate object for long periods of time. However, due to the low speed of the camera film and light restriction (plus, as this is Bristol, plenty of overcast days), the six-month exposure brings a surprising amount of detail to the shot. Every day when the Sun was shining (and days when it was struggling to get through the clouds), the path it made through the sky every day was captured.

The original site is Pinhole Photography and has some very interesting pictures and information. Also check out the Solargraphy site.