Question, How to Apply gradient to length in a complex geometry - Rhino + V-Ray 2.0

[saeedsh]

So I've been playing with grasshopper and generated an organic form and want to apply a changing color with respect to its length... at the base Dark and as it gets thinner at the end the color is brighter. please see the attached picture to get to see the geometry I'm talking about.

 

 

Also, how to do I make a texture flow along with the geometry... or how do I map it to make it go with the shape so it stretches and bends based on the geometry.