Find a few ideas here
Create Gnosis events and us an oracle provided by:
Create an alternative user interface:
Interface focused on hedging - select how much this event would damage you and the interface will give you a price to "buy an insurance" for this event.
Built an chatbot interacting with Gnosis. (e.g. Twitterbot)
Build a flight insurance app (similar to https://fdd.etherisc.com/)
Build a insurance app again rainy (Sun)day.
Build binary options for token prices.
Build markets on (token A vs. token B) (which one will perform better)