Solargraphy is the art of using long-exposure pinhole cameras to record the path of the sun across the sky. The above example (click through for enlarged version over at APOD) is a six month exposure taken in Bristol, UK. Here are instructions to do it yourself - no processing required beyond use of a scanner after exposure.
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More information about this particular technique:
http://www.solarigrafia.com
http://free.art.pl/solaris/solaris/Solaris.html
http://free.art.pl/solaris/solaris/Cyclography.html
http://www.peuta.republika.pl/kula/kula.htm