For a different twist for people who are searching for that breathtakingly amazing calendar, here's one that definitely is out of the ordinary. The Lindner Company, a Polish manufacturer of coffins, offers each year a calendar featuring scantily-clad models posing on or beside their wares! I've included an image below to give a sample of one from an earlier year; some of them are definitely NSFW or for impressionable children.
This one might be a great stocking-stuffer for Goth guys, too!
Anyway, if you wonder how far the art calendar market will go, this might give you an idea!