What calendars are available for 2019? Let’s see:
Hozuki no Reitetsu, with goldfish plants.
Girls und Panzer, cherry blossoms and tanks.
Yurucamp, camping for introverts.
There are many more anime calendars here. Most of them are Japanese-style, with six large pictures, one for each pair of months, rather than twelve smaller ones.
Update: Let’s also not forget the Social Justice Kittens.