What is a good idea for a iphone app?

I own a huge instagram page and i sponsor apps for shoutouts which in return gains them popularity. I make a lot of money doing this but now i want to make my own app. I need some good ideas that would become a popular app. I can spread it out on my page so getting it out there and sponsored is easy, i just need some good ideas on what you guys think could become very popular. I'm giving 10 points to the best ideas.

You could do a video app making videos. Or a calendar app. Or even a bingo app. I can never find any good ones. Or even a photography app. To help take good pictures. You could maybe have mini contests on the game. Like quotes or landscape. That would be really cool.

My ideas are not free.

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