Back to the future
Since I started working on Centennial (aka Desktop Bridge) tooling I created a simple sample app called BackToTheFuture to test the end to end scenario of creating an app publishing to the store.
The app is a WPF UI using some of the centennial goodness like the virtual registry, and access to Windows 10 APIs.
The app is available in the store here and you can see the source code in https://github.com/ridomin/backtothefuture