Sitefinity 4.0 will be shipped with 3 different starter kits. In these projects there are different templates and themes and you will be able to see how they are structured. All the files of the templates - CSS files, images, skin files, master pages will be available in the projects. In one of these starter kits there will be a back-end theme which will show you how to style the backend of Sitefinity depending on your need.
If you are interested how to create a website template for SF 4.0 there is a tutorial
that you can follow.
All the best,
the Telerik team
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