"XAML to Image" is a set of project templates for Blend for Visual Studio and/or Visual Studio. By using the templates, you can design images or icons as XAML, and export image files such as PNG, GIF, etc.
Visual Studio 2012, or later.
(I tested with Visual Studio 2012 only.)
See Setup.
You can customize this template to suit your needs, such as file naming rules or adding dynamic image effects, etc.