I work on the Composition team at Microsoft that builds the Windows.UI.Composition APIs for the Universal Windows Platform.
This project is where I'll be putting demos of the API's functionality when I get time :-)
Our official team sample repo is here: https://github.com/Microsoft/composition
This currently compiles and runs on the latest Windows Insider preview build of the OS with UWP SDK 10563
This is the VirtulSurface demo:
There are also some more C++ demos in my fork of Kenny's cppwinrt demo project here: https://github.com/clarkezone/cppwinrt