The wall next to my computer this year is decorated with a royal calendar. When you’re looking for it, there are several ones available, although it might vary per year. I bought mine from photographer Albert Nieboer from Royal Press Europe, who has done a great job, and created a calendar with lovely photos. There is however very little space to write something on it, but I don’t really care.
If you are still looking for a calendar, here a few ones that look quite good. If you know of any other ones, please let me know.