It's the day before Halloween, and since a lot of you will actually be out there celebrating it, I'll go ahead and upload it for your childish amusement.
I'm not going to claim it's the best thing I've ever done, and some of the coloring is rather experimental, but the overall gist of what I was trying to convey; for this year's Nightmare Night celebration, Princess Luna decided to visit Ponyville. Its inhabitants, all dressed up as fictional characters, are in awe as the ruler of the night performs a spectacle in the night sky.
So let's play a little game, try and guess the fictional characters without peeking at the rest of this description. For those who want to know, here are the characters and what they dressed up as (sans Luna because she's obviously not in costume).
Rainbow Dash: Lara Croft [Tomb Raider]
Pipsqueek: Generic Pirate
Button Mash: Super Mario [Super Mario]
Pinkie Pie: Chell [Portal]
Babs Seed: Toph [Avatar - the last Airbender]
Applebloom: Solid Snake [Metal Gear Solid]
Cheerilee: Zia [Mysterious Cities of Gold]
Sweetie Belle: Princess Peach [Super Mario]
Scootaloo: Zoey [Left 4 Dead]
Rarity: Jade [Beyond Good and Evil]