Some triggers to get you started:
Look around your world. Take an observation walk. See if there's anything you can literally see that needs some improvement.
Get together with your friends and think up 10 ideas together.
Think of your talents, skills, & interests. What do you like to do? Think of your friends' talents, skills, and interests. How does a friends' talents mash-up meet the needs you see in your community or in the world at this present time?
Who in your community can be of help to you as you try to make something better?