One of the missing templates in the Windows Phone SDK is Resource Dictionaries. If you work with styles and resource dictionaries, the missing template is a big thing.
Worry no more! I have created the template you need!
You can get them ItemTemplate from my SkyDrive and install it in your ItemTemplate folder, typically located here:
C:\Users\[USERNAME]\Documents\Visual Studio 2012\Templates\ItemTemplates\Visual C#\Windows Phone\1033