Finland's Kirlian Crossing has posted an excellent gallery of photos they've taken using homemade pinhole and Kirlian cameras: http://www.verdurarecords.com/kirliancrossing/gal/gallery.htm
There's some really exceptionally cool images there, so I highly suggest checking it out. The band also has a new video posted online, should you be interested in the music as well: http://www.verdurarecords.com/kirliancrossing/media.htm