Since this last year, the calendar in appropriate subjects. Each month - different versions of Doomsday.
It is based on the picture Gil Elvgren'a.
Global cooling
Nuclear war
Space invasion
Volcanic eruptions
Deluge
Rise of the Machines
Global warming
Zombie apocalypse
Earthquake
Pollution of the planet
Infection
Meteorite
Source:
www.tarusov.blogspot.com