These are some pieces by Big-X.
I love this huge chunk of legos! He calls it "Ancient Ruins."
And it has some nice details. I find it tricky to make bigger trees. Love this one.
These octopi are incredibly creepy.
His Void Fighter:
This is one massive ship called, Porphyrion. You gotta check out more pics over on Brickshelf. Really nice interiors and exterior details.