Take a look at these
Windows Phone 7 design templates that can help you to easily create common Windows Phone UI layouts.
Source: CodePlex
A project for sharing XAML based resources for creating consistent Windows Phone 7 user experiences. The templates are based on the UI Design and Interaction Guide for Windows Phone 7. With these templates you can easily create common Windows Phone UI layouts by simply copying and pasting the desired page. We’ve taken care of the margins, styling, and custom controls that may not be available in the platform.