Fog

Just having a fog overlay every now and then would be really beautiful with the already amazing landscapes.

 

Should only be on some planets, may be more dry or humid planets. (Dust, and Mist)

 

I was just using fog as a generality, so yeah that'd be boss too. I think Dust storms or Sand Storms are being implemented in the future.

 

Or different weather densities. The higher the density of water / snow / fog, the more obscured the landscape.