Have played around with various atmosphere settings to produce a "marmalade" sky - it is supposed to reflect a cold English morning on Dartmoor.....mmmm....not sure it works!
This is interesting. The rocks kind of look like lava rocks (like the rocks here, where I live). The colors make me think I'm on Mars, actually. ;)
I must admit I was trying to produce an Earth type sky - having difficulty turning the sky red!!