Teaching a very basic toolkit of major question types is a good way to spark more curiosity. The better questions you have the more you can use your curiosity in interesting ways. See the attached toolkit.
How does this idea help to spark student curiosity?
There is a virtuous cycle between questions and curiosity. The better questions you ask, the more you see the positive results of curiosity and the "curiouser & curiouser" you become...
What grade level is this idea most appropriate for?