Perlin Noise

I'm currently in the midst of writing a 3D PerlinNoise generator class in order to add cool procedurally based textures like marble or wood to my objects. What is cool about 3D Perlin Noise is that it can be applied arbitrarily to any mesh of any size without having to worry about UV coordinates and warping.

Here's an example image of what I am talking about. I calculated a marble noise texture to every object in my scene.