An average Scum team will do 26 retrospectives a year. Using your favourite retrospective method 26 times in a row can become boring and unproductive and eventually the marginal utility will decrease. It’s a good idea to trial different retrospective techniques to keep the team interested and fresh ideas coming.
These are three great resources for different activities that you can use at retrospectives.
Note that some techniques will be better than others and like all things Agile you can stop doing the ones that don’t work and do more of the ones that do work.