I made a Summer Doodle last year, following the tutorial of importing DEM terrain data.
Unfortunately, I don't have so much memory, so plants ect. could'nt be added...
DEM Heightfield Terrain Import (Mount St. Helens) - Kamera Caldera
DEM Heightfield Terrain Import (Mount St. Helens) - Kamera Crater
STORMLORDhttp://www.dirkkipper.de/Galerie_Terragen/Terragen_02/index.php