Have you ever thought about creating your own app? What idea do you have that may make a great app?

Have you ever thought about creating your own app? What idea do you have that may make a great app?

Yes, creating an app would be cool and innovative but I have never had a solid plan. A few times I have come around to something I need and said "It would be great if there was an app for that. This could be an interesting invention if I did.