Earlier this year I have blogged about a Sitecore package to convert the Sitecore sample items to use MVC based presentation. With Sitecore 8, you still need this package when you want to turn the presentation to MVC. But it does not fully work as Sitecore has changed the markup for the sample renderings.
I have updated this package to work with the new layout for Sitecore 8. So if you need to test some MVC implementations on a clean Sitecore 8 installation, this should help you easily start with it.
The package can be installed over the Sitecore Installation Wizard.
Update: The previous package (version 2.0) was built on the Technical Preview of Sitecore 8. Because the final release has a different layout, I have updated the package to version 3.0.