You are out in a public place like the beach and would like to take a picture of your kids playing. The pictures you take look good, but there are too many distracting objects in the background, mostly people.
A smartphone app that recognizes all objects in the picture lets you click on the ones you want to keep, and eliminates all others while still keeping the picture looking good and realistic.
A fun game to discover interesting designs and artifacts.
Publish a daily photo or video of seemingly simple objects and let people guess (not public until the end of the day) what they are. At the end of the day, the people who guessed right are listed in chronological order. The first 30% of these get points. The leaderboard of best guesses is updated daily.