Few things are as challenging as trying to color a night sky. That's why I generally stay away from it. The few times I have attempted it, it took a really long time but looks like it didn't. Black and navy blue are the obvious choices, but there are really many shades to a night sky that differ from those colors. Alas, I took the "easy" way out as you can see below and did what I said not to do. Why? Because I love glitter and sparkle, and these gave me an excuse to use it.
From Summer Nights by Hanna Karlzon
From Enchanted Fairies by Barbara Lanza
From Santa's Furry Helpers by Kayomi Harai