I need a tree trunk

Check out this incredibly crude paint over. I reckon it would be cool to have some massive epic tree trunk right in the middle of the jungle:




Can someone knock out a quick model of one? don't think it should be too hard, just try and keep the textures quite dark and in keeping with the rest of the scene.

Some inspiration:

http://farm1.static.flickr.com/85/213549514_c05a9abb6e.jpg?v=0
http://www.worldoffilmcraft.com/wp-content/uploads/2010/06/wow_world_tree.jpg
http://media.growsonyou.com/photos/blog_photo/image/1348/main/trunk_of_wellingtonia.jpg