When releasing RadControls for Silverlight and WPF we are making all our controls work properly in Blend. Some of the controls are fully customizable some still have limitations but we are working hard on extending our Blend support with every release.
Tutorials on styling our controls are on their way. We have planned on releasing a series of articles on how to use Blend in customizing our controls (starting with RadGridView) which we believe will be helpful for designers and front end developers.
I hope you will like our demos and looking forward to work with you in the future.
All the best,
the Telerik team