Haze of Titan
The atmosphere of crescent Titan, backlit in color:

There's been some discussion in the Celestia forums over whether the blue and violet haze layers of Titan would actually be visible to the unaided eye. But this is a visible-light image and I don't think it's far from natural color (I used a violet-filter shot as well as RGB to bring out some of the higher layers, but tried not to boost the blue too much over what the RGB composite had). I suspect that you'd see those blue layers at least when looking the horns of a crescent Titan.
There's been some discussion in the Celestia forums over whether the blue and violet haze layers of Titan would actually be visible to the unaided eye. But this is a visible-light image and I don't think it's far from natural color (I used a violet-filter shot as well as RGB to bring out some of the higher layers, but tried not to boost the blue too much over what the RGB composite had). I suspect that you'd see those blue layers at least when looking the horns of a crescent Titan.