The January 2003 issue of Astronomy had an article "Under Alien Skies" that investigated what the sky would look like from the surface of planets in multiple locations, including inside a nebular.
There is a making-of article here: http://www.badastronomy.com/media/inprint/underalienskies.html
It starts with the bad (boring) news:
I immediately ran into a problem. Although the nebula is bright enough to be seen by the unaided eye even from 1500 light years away, I quickly realized that from up close it would be invisible! This shocked me, but I knew I was right. The problem is that the gas is almost transparent, what astronomers call "optically thin". It glows because it is energized by the flood of ultraviolet light from the Trapezium stars.But since the nebula is transparent, we see light from every atom of it all at the same time; the light from atoms on the far side of the nebula comes right through the gas. That means that the light we see is all the light there is from the nebula.
But then gets to the good news:
"The light from the thin gas would get spread out, but there are narrow shocked filaments all through the nebula. Those are small, and they'd still be bright.".
"So, " I replied, "the sky would be filled with a web of ghostly green tendrils?" He nodded. "Yep."
And the interesting news:
Then, disaster. Jeff Hester called back... and said everything I wrote about the Orion Nebula was wrong. Gulp! He said it would be accurate for a nebula that is just rarified gas, but the Orion Nebula is far more than that. It's actually part of a much larger thick molecular cloud. This cold cloud of gas and dust is completely opaque to visible light. The Trapezium stars formed in it, and they are so hot that soon after they switched on, their heat and UV light started carving a cavity in the cloud. They were near the edge of the cloud, and eventually ate their way out to the edge. The cloud blows out from there, allowing us to see in.
But those stars also illuminate the thick gas in the molecular cloud. Since this gas is thick, from up close it would still be bright!
The original article had images to accompany it, although they don't seem to be easily found online.