My mom gave me this desk calendar that is really cute and simple to make. She got the idea from her friend who is a Close to My Heart consultant.
To make one of these, you first need to cut a 12"x 12" piece of cardstock into a 5" strip. Then you need to find paper to go with your winter, spring, summer, and fall theme. Then you can do an online search for a small calendar image and you print three months next to each other (for each season). The pictures of the calendar are make it pretty self-explanatory.