I think this one is my favorite. The process is called "through the viewfinder" (TTV).

Apparently, it's all the rage in the photography industry. The process is where you take photographs through the viewfinder of an old camera. Check out flickr's group, Through the Viewfinder at www.flickr.com/groups/throughtheviewfinder/. How totally awesome is that?! Who came up with this stuff? I love it!