18 refreshing ways of an agile retrospective

As a Scrum Master I asked myself which types of retrospectives do I know and put them down on small Post-it.

In the end I came up with eighteen ways of agile retrospectives and one of them jumped into my mind. It's the one with the frog who is telling in Germany the weather. 

Hope you like it and if you have some further recommendations of more ways for retropectives pleas let me know.