Blender 2.71, rendered in Cycles.
This is very much work in progress. I was mainly aiming to get the top of the post right, which I think I have.
The sides don't look right because I used the material from a mossy rock in another of my images and mucked about with the colour to make it more brown and less green. I will have to work on a properly UV unwrapped texture which comes from wood rather than stone.