Keith Goldman, aka Don Quixote 2x4, has built The Dragon Wall, based on the adventures of the characters from Avatar: The Last Airbender. The sheer size of the wall is impressive, and the mosaic-esque pattern on it is well-achieved. The landscaping and the way the road and bridge are built is also fantastic. While not from one particular episode, it does capture the essence and feel of the show well. Enjoy the pictures:
and of course an illustration of the famous and iconic line: MY CABBAGES!!!