It's funny I happened across this thread, because I was just outside looking up at the night sky and wondered to myself, "What makes this sky so inspiring?" The fact that it's really nice outside right now, helps, I think.
I'm just not sure how you would capture that feeling with just graphics, though. It's an all encompassing feeling to look up at the sky, that is more then just a visual curiosity. So while I'd gladly enjoy a 'realistic' interpretation of the sky, I wouldn't be expecting it to grab me quite like it should, perhaps.