I saw these in person the other day, and given that people were discussing making wire trees for treemen / treekin, I thought I'd share it here. These pics are from the artist's website, the ones I saw I snapped a few pics of but my phone is currently dead...
http://www.sanderswiretrees.com/
Of course, there are also the excellent Raging Heroes models:
http://www.ragingheroes.com/collections/complete-collection/products/the-tree-warriors
Both options (assuming the "wall trees" from the wire artist, not the ones on bases) are
cheaper than the
GW ones. Definitely something to consider!!!
The wire trees are rather large, but then trees should be- the smallest size would definitely work for a treeman, or perhaps you could use it for a large treekin, and the next size up for a treeman.