They are copyable and can be changed by using the HUD (8 themes and a few hundred textures to choose from). Like the previous versions, these landscape items also make use of the new materials: higher morphological detail on the hills (yes, I am a geographer), and cut-off alpha textures to make sure the trees do not interfere with alpha textures on your land (to prevent "texture bleeding"). Make sure to use one of the latest Second Life viewers and enable the Advanced Ligtling Model.
The half sim surround and the edge environment will be discounted by 50% until Tuesday April 1. As always, free demos are available on my island and on the marketplace.