Miguel Gasso recently uploaded a series of uncut videos to YouTube.
In those video tutorials, you can learn how to create a ring with T-splines for rhinoceros. (Be sure you have some experiance on t-splines before watching those tutorials.)

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DEZEEN, one of the most popular design blogs on the internet, interviews Mark Sanders.
Here’s the interview http://www.dezeen.com/2008/02/03/interview …-sanders/
An interesting read on the history with original sketches from Mark Sanders

Now you can download a Material Collection from Vray.com. It contains 140 high quality .vismat materials for use with VRay for Rhino.
A wide range of material types are included such as the following:
- Architecture
- Car Paint
- Cloth
- Emissive
- Glass
- Leather
- Liquid
- Marble
- Metal
- Misc
- Plastic
- Porcelain
- Rubber
- Stone
- Wax
- Wood
After i download that zip file, I find this collection might be from CD-ROM attached with books by cafer. By the way, those books he wrote met with a warm acceptance.