That approach would work, but it would also require that I change many of the UserControls in the tutorial using the method you described. After some research, I found that an easier approach was to add the following to the web.config.
| <appSettings >
| <add key="Telerik.EnableEmbeddedSkins" value="false"/>
Since the TIU tutorial is geared towards beginners to your platform, I'd highly recommend you make it easier to use out of the box. I've had a devil of a time trying to get this to work.