Justin Quinnell left his homemade pinhole camera open for six months to capture a time lapse of both the Summer and Winter solstices. The lowest streak is the Winter solstice on 22 December 2007 and the highest line represents the Summer solstice, captured on 20 June 2008 (image above).
Specializing in pinhole photography in addition to long term exposures, Quinnell has a few other series. One favorite, Mouthpiece, consists of photos taken from the perspective of an open mouth. Be sure to visit his site, Pinhole Photography, to view all his works