A while ago, I built Trivia Monkey as a way to get familiar with C# and mobile development for Windows Phone. It implements some interesting ideas I had mainly around deep heming (from xml styles). Its now available for all Windows Phone developers on GitHub as an open source project! Unfortunately there isn’t much documentation for now or tutorials around it … you might just have to use it as it is.
The app code might work well as a way to create visually attractive themes for your Windows Phone app if you are not interested in building a Quiz app.
If its helpful to you, please feel free to leave a note!