Yep, I'm totally aware of the cool atmospheric effects one could get with planetary atmospheres. My point was that the atmosphere itself isn't creating light (by itself at least).Well, a noble gas based atmosphere close enough to a star could glow like a neon lamp. Something like northern lights just throughout the atmosphere on the day side.
If this is what OP was talking about, he really didn't do a good job of presenting it. I totally agree with him if this is what he actually meant to discuss.