This video tutorial goes through the steps to creating a blend material in VRay for Rhino. The key steps in this video can be found below:
00:00 - Introduction
00:30 - Blend material creation
01:20 - Adding the 1st Coat to the Blend
02:11 - Using maps to control how the materials blend together
03:50 - Adding multiple material coats
04:10 - Using noise maps to blend textures
06:05 - Combining blend material with VRay Fur