i was looking through ebay and spotted this conversion
http://cgi.ebay.com.au/Road-Bike-Fixed-fixed gear bicycle-Track-Single-speed-Pista_W0QQitemZ120489210420QQcmdZViewItemQQptZAU_Sport_Cycling_Bikes?hash=item1c0db77234
take a look at the drive side crank. look to be a pair of old single peice cranks that the top chainwheel has been ground off.
so much dodgy creative shit on ebay.