Firsty, prahaps asking at the anim8or forum would be a better place?
I don't know if animator is capable of doing this kind of thing, but its just a factel, or perlin noise texture put onto the displacement channel for the bumpyness.
Then for the colour, either its the same noise map running a gradiant colour generator or its based off the height.
So... don't you know how to do? ok... you can say... maybe here there's someone who use anim8or and know how to texture a mesh like it... and by-the-way I've also posted at the official site of anim8or but there are 2 person logged on...