I recently visited Berlin where I spent a rather long time in a department store trying to find a 2012 calendar. They had hundreds to choose from but nothing that really grabbed me. I then spotted this brilliant blank calendar. They came in lots of different sizes and a few different typefaces. I expect you can get something like this in the UK, but I've never seen them before.
I wracked my brains for a few days and settled upon prints of some of my recent pattern designs. Here are the results: