The trees on the first two images are free mesh, which I use on almost every maps I make, because they look epic.
Give me 2 min and I will put up a download for these, or I will edit the official download for the mesh in this post.
Edit:
Okay, here it is!
I couldn't find the original download, but here is the mesh in a package with all free mesh I got from the download.
http://www.mediafire.com/?op2af9iz6nzwpi7It contains: The teo trees, a house, a (rope)-bridge, two plants and two rocks. Oh and a tower.
Btw, thanks for posts! ^__^