I don't have too much space for calendars, so I limit myself to a few favourites.
In my hallway, I have Martina Hoffmann's "Mädchenkalender". It makes me happy every time I come home, open my apartment door and look at it.
You can order the calendar (there are three paper sizes) from Martina's DaWanda Shop "Stift und Papier". She also has lovely postcards and prints.
First picture: calendar 2012;
second picture: from this years calendar;
third picture: some of the postcards, I have also ordered.