I love the idea behind this post. Luca had a need and made a simple app to solve his own problem. This is the best way to get motivated when you are either new to coding or need to inject some life into your dev career. Solving your own problems is both rewarding and a great learning experience.
Quit That!, my app I've talked a lot about recently, though a bit more complex, followed the same storyline. I built it in a couple weeks in my free time and it was such a rewarding experience.
How to develop an entire app in 3 days. by Luca Kiedrowski