I did this a long time ago but I finally rendered it in higher quality.
Fullsize (1680 x 1050): http://www.pasteall.org/pic/show.php?id=7026
Render time was 5min 34sec on my two 2.4GHz processors.
They are all procedural textures besides a wetmap on the big rock. The small rock in front of the big one is a volume texture.
Rendered in BI, enjoy. 