I strongly recommend Nene Thomas’ fantasy calendar. She renders lovely fairy images with great depth and color.
Below is the back of my current (2011) calendar.
She has limited quantities of her 2012 calendar, so you might want to go to her site and order one, the way I did yesterday. Current price is $20.00. They ship by UPS, which might make it seem pricey, but it’s something truly different from what you can pick up at a mall.