Obviously, a 2013 calender wasn't made. However, I think this happened because of a lack in organization and pre-planning. This thread wasn't even created until the end of 2012.
We should all start work on the 2014 calender ASAP. Those of us which plan on partcipating should take the shots before the last month of 2013, and use a simple program like Irfanview to resize appropriate requirements.
I'm completely for a 2014 calender. I just hope everybody else bothers to check this thread and decide for themselves if they want to help make it happen.