Land generator for my game - please criticize

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My average rendering time is about 13 seconds per map.

My laptop spec is:
Turion 64 MT-40 2.20Ghz
1Gb RAM
ATI X1600 256MB

And I'm running the 32bit version of Vista.

I must say, the more vivid snowy landscapes look wonderful. I love the rich blues, pinks and reds. And the strange straggly columns lend a wonderfully surreal feel to the landscapes. I'm not too keen on the maps that use more subdued and dreary gray colours. If I were you, I'd try to keep everything as rich and vibrant as possible.