http://omaralzabir.com/droptiles-metro-style-live-tiles-enabled-web-2-0-dashboard/

This is not free templates:
http://themeforest.net/

http://blogs.msdn.com/b/dotnet/archive/2012/04/17/net-for-metro-style-apps.aspx

http://www.codeproject.com/Articles/442856/Visual-Studio-2012-Metro-Styles-for-WPF

http://www.drewgreenwell.com/projects/metrojs

http://blog.csharplearners.com/category/metro-style-apps/

http://www.intellial.com/intellial-blog/entry/metro-style-app-development-using-net

http://code52.org/metro.css/