New Idea for Windows Phone
It doesnt feel like Windows Phone though more like a skin and seems rushed as well losing bright colors that make windows phone unique.
As you can see in the image below, the bright colors of the start screen let Windows Phone 8 stand out. Colors are crucial to main design of Windows Phone.
So what i am proposing is allowing the app to fade into the background, this feel can be seen in Windows 8.1 with the wallpaper fading and the start screen floating above.
As you can see from the example above, it flows very cleanly into the start screen all without leaving the application.
The transition of the app to the start screen and back is now smoother than ever.