With the absence of VisualBrush in WinRT, I am not sure the approach. Anyone?
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1Confirmed, TileMode is not in this version of Metro/XAML – Jerry Nixon Jul 02 '12 at 14:52
3 Answers
At the moment I don't believe there is a way, while ImageBrush inherits from TileBrush it's missing the important property TileMode. It's unclear whether this will be included in later versions.

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Indeed there hasn't been much information given in regards to XAML styling WinRT besides changing Dark and Light themes...
so I guess we have to fiddle and experiment...
While doing some googling on the web I came with the following link... might as well give it a shot...
Creating tiled backgrounds in Metro style XAML apps
http://www.robfe.com/2012/07/creating-tiled-backgrounds-in-metro-style-xaml-apps/
Note that it might work in full screen though I ain't sure on how well it responds to snap and rotation.

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looks like typo it in url. it should be http://www.robfe.com/2012/07/creating-tiled-backgrounds-in-metro-style-xaml-apps/ – Alan Le Sep 19 '12 at 18:19
http://www.mindscapehq.com/ now have a TiledBackground control.
http://www.philliphaydon.com/2013/01/windows-store-app-tiled-background/
<ms:TileBackground ImageSource="/Assets/debut_dark.png" />
Requires a license to access the nightly build.

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