The best source of ideas is to look at what's available on Google Play and other Android game stores. Type in keywords such as “quiz games”, “football quiz”, “nature quiz” - whatever subjects you like. If you include “quiz” in the search you'll find games similar to ones you can build with us.
There is also a “category” option on Google Play, where you'll see games within specific categories. You never know where you'll find inspiration. Always be open for ideas to come from anywhere – they don't have to be online!