Hi Julian Borthwick,
We will be definitely enhancing our documentation for the next Q3 2009 release. We have major plans for documentation improvements and we will put lots of efforts and resources in this direction. In the end, there will be styling and theming articles for each of our controls.
In the meantime, we will be gladly assist you with any task you want to accomplish when customizing the appearance of our controls.
the Telerik team