Ask HN: What problem isn't already solved in iOS app store?

Hi, I am student at Georgia Tech studying Computer Science. I have ten days of vacation till school starts and I am bored to death. I want to learn writing iOS application but thing is, every time I start following a tutorial, I give up easily because the final product isn't something I really want. Hence, I am looking for an idea that you would like to see in App store? I am looking for a new problem to solve or a solution that could be done better. Thanks.