Candy Cane Camera App
A few years ago I started a little app company called Pixmondo. Candy Cane Camera was a photobooth-type app that lets you take a picture and add stickers to the picture, then share it.
I created the app using a predefined template for the functionality, and then I redid all the graphics. This involved doing a lot of versioning and creating sets of graphics for each iPhone version. I also had to do extra stuff such as ad images and icons for the app store, and I created a website for it as well.
I had to dig into X-Code and learn how to integrate all the customizable functionality such as the monetization/ads and the bonus packs. It was a really cool experience, and a lot of fun to see it on the app store and to be able to tell friends to download it.