After an incident with the heart of Liberty, Niko Bellic finds himself awake in an unusual hospital. He quickly learns that he is no longer in Liberty City. His rough, gravely world is about to be turned upside down.

A meeting of some fanon incarnations of Celestia.

Applejack finds a strange visitor in her apple orchard one day, with even stranger stories to tell...
MLP/L4D2 crossover. My first story on FiMfiction.net! May add more tags as story progresses.
Credit for the image goes to brokencreation on DeviantArt.

Luna has had enough of Celestia's games, and has found the perfect means of revenge. Using a long-forbidden spell, she transforms her sister into little more than a small filly, all so she could pull the greatest prank ever. Unfortunately, she soon learns that before you fool around with dangerous magic, you really need to read the fine print...

A sequel can be found here.

Spike only wants things to stay the same. Time, however, has other ideas. He's going to need a lot of help... An everypony story.

(Cover image by Rannva)

Twilight is invited to Canterlot to compete with some of the greatest magicians in the world for the Moonstone Cup, a prestigious award for the most powerful and skillful magicians, unicorn and otherwise. Can she win? What sort of competition will she face?

Awesome cover image was taken from NoOneBahtim

When Rarity is overwhelmed with making designs for an agriculture exhibition, she turns to Applejack for advice. But when she gives Applejack a hair style treatment in return, the apple farmer lets her accent slip from southern drawl to sophisticated Manehattenite. The result? More fancy parties than you can shake a candy apple at!

Twilight's cutie mark is fading, and Celestia sends her a series of lessons to rekindle her passion for magic- and for friendship. Twilight must study the magics her friends possess, as well as casting a serious eye on her own gifts.

This is technically a sequel to "Fixing Up Miss Smartypants", so I totally recommend that you read that first. It's set five years later.

He is a college drop-out part-time worker. He is a dentistry student. Together, they are two total twats with no ambitions to go further then the next game, comic book or puff.

And now, they are ponies. Under the names of Lucky Chance and Midnight Watch they must find a way back to the human world using their extensive knowledge of the television show, the Laws of Narrative and sarcasm.
Will they be able to rise above themselves and face the many challenges that await them? Will they be able to figure out the true meaning of Friendship? Will they be able to not murder each other or themselves while doing so? Do they even want to go back?

Cover Image by CenturionFox13. Proofread by Letedwend