Well, maybe you've heard about my planned calendar for 2013, the "Monters in HotRods". I'm very sad to tell you, that the callendar won't be completed to the end of this year, so it will be impossible to have a 12-month calendar clear with Monsters.
Do you worry about it? You shouldn't worry about it.
Here are the possibilities how to solve this problem:

Make a 6-month calendar.

Make a 12-month calendar with 6 pictures

Make a less than 12-, more than 6-month calendar (as much pictures as I can draw since the end of the year)

Make a calendar with combination of my older drawings and the finished "Monsters"

Make a 2014 calendar

the worst possibility: Make no calendar

Please vote in comments for the best possibility for you