Followed a Terragen tutorial here: [link]
And got this
Still rendering as i type this.. now at 16:48:00 VERY long.
Almost done though
DONE: 17:12:59s to render 7 718 092 micro-triangles.
wow. Post-effects in Photoshop. Just used duplicates of background layer, two dups and then vivid light and soft light - on the soft light I also made some colour balance changes