Polaroid Time Zero
I find this series of photos so stunning! I think this effect is achieved by using out of date polaroid. Here is a link to the Flckr account: Gentleman Amateur/Polaroid Time Zero.
I love this photo by Mark Burban it is featured on the 500px website. He says that it was created by taking 9 seperate long exposures and stacking them in photoshop which resulted in this final composition.