I've been wanting to do one of those snowy mountain scenes for a while, especially with a glacier.
This one took about 5.5 hours per core to render. Combined, it would have taken over 22 hours, which isn't too bad for TGTP.
Native Res: 800x600
Quality: 0.8
Terrain modelled in world machine.
The glacier was placed via an image map, generated via world machine's flow map output.
I used a modified form of the "pacific grove rock" technique for the foreground rock.
Everything but the glacier's flow map is procedural. Having fun!