Tile
The Tile is exactly as it sounds. It is a rectangular control whose sole purpose is to mimick a tile from Window 8/WinRT’s Start Screen.

How to use the Tile
The following XAML will initialize a Tile control with its Title set to "Hello!" and its Count set to 1.
<controls:Tile Title="Hello!"
Width="100"
Height="100"
Count="1" />
In the wild
Here are some screenshots of the Tile in action.