Check the Renpy forums (lemmasoft.renai.us) there are 1000s of comment threads, some of which definitely discuss your question.
There is at least one massive thread of example minigames, including drag and drop image unscramble.
One warning: the forum has been around for more than a decade so the versions of Renpy have changed a lot, some of the older posts (pre 2015) will potentially be related to the "old way" of renpy coding.