I down loaded a Photoshop action that mimics an image taken with a Holga camera from action central and tried it with this image. I think it worked pretty well. The selection step makes a square selection. I am trying to figure out how to change that and try it with some other images.

Here is a link to the action. It is from the Adobe Studio Exchange http://www.adobe.com/cfusion/exchange/index.cfm?event=extensionDetail&loc=en_us&extid=1041534