Awake and alone, Applejack will find a way to survive.

And here's a TV Tropes page, if you're into that kind of thing.

This isn't where I belong. I left all this behind years ago, moved on with my life. But a mare from my past brought me back, and now she won't let me go. So I'm stuck here, trying to make the best of it with ponies that don't understand me, don't even like me. But when something moves in the darkness, and when things go wrong in the cold, dead night, they'll turn to me to try to set things right.

Why? Because once a police pony, always a police pony.
~~
This is a spin-off story to 'Why am I Pinkie Pie?!', and will contain spoilers for that story, but it's not necessary to read that story to understand this one.
Cover art by the talented Conicer
Need more Cinnamon Swirl? Merlos the Mad wrote a fanfic of this story!

There is now a side-story: A Hard Day's Nightmare Night

When Fluttershy received her certification as a fog specialist, she only wanted a plausible excuse to write off the expenses associated with her ground-based house on her taxes. However, when an accident in Cloudsdale sends a blanket of industrial-grade clouds rolling towards Ponyville, Fluttershy suddenly finds herself in charge of coordinating the response, mostly because she's the only fog specialist in the area. Can our heroine step up to the challenge at hoof, or will she risk facing the wrath of the Equestrian Revenue Service?

Artwork by Page Turner. Now with a TVTropes page!

An alternate universe story, in which Twilight Sparkle was born a pegasus, not a unicorn. Because of this, she isn't Princess Celestia's personal student at the School for Gifted Unicorns, and she can't wield the Element of Magic. Can she still help save the world from Nightmare Moon? Or will she fall under the dark powers of nightmares?

This was somewhat inspired by Rainbooms and Royalty, a story in which Princess Celestia picks Rainbow Dash to be her personal student.

During Discords reign of chaos over Equestria, he managed to corrupt everypony in Ponyville. Even Twilight Sparkle. But how will he deal with a mysterious stranger that refuses to be corrupted?

(Takes place during the Return of Harmony)
(Based off of the story of the Buddha vs Mara)
(Discord and Buddha are like foils for each other)
Edited by syvvak

Twilight isn't having a very good day. An experimental spell blew up in her face, an army of changelings is attacking Canterlot, and she just died. Yet somehow, it looks like it's going to keep going downhill from here.

Given the chance to correct what's gone wrong, Twilight swears she's going to fix all this even if it kills her. Which it will. Frequently.

Cover art by Pixel Prism
Spanish Translation
Series TV Tropes page

Deft Hoof isn't the strongest earth pony around. He's definitely not the biggest. What he is is one of the greatest thieves in Equestria. Possibly the whole world. Now, his employer has decided he needs a vacation, away from the hustle and bustle of the big city.

How's a thief supposed to get by in a town like Ponyville, anyway?

Multiple Image Sources:
Applejack - Shocked Applejack by MyLittlePinkieDash
Sweet Apple Acres - Sweet Apple Acres by GameGuy001
Orange Meringue and Final Image - by SUBJECT-241

When Twilight Sparkle slipped beneath the covers last night, everything had been fine. She had friends whom she loved, a teacher she adored, and a bright future ahead of her. But when she woke up, her blankets and quilts had been replaced by hospital gowns and padded restraints.

Everything is wrong and nothing makes sense; even her friends have changed. The doctors keep telling her that she is sick, that none of it was real and that it was all in her head. Yet she remembers a life far beyond the hospital walls. She couldn't have made it all up on her own. They must be lying… right?

Ask Asylum Twilight - Still updating regularly!
Equestria Daily
TVTropes
Asylum Fan Group
The Tartarus Project
Russian Translation
The Asylum 20,000 View Spectacular Stage Show!

Art:
Asylum Cover by conicer
Twilight and Twilight Smiles by dreamingnoctis
Mirror Twilight and Plague Doctor by Jaestring / BloodGoldWings
Twilight Smiles and Doctor AJ by conicer
Nurse Ratchet and Silas and What's in the mirror? by Archonix
Doctor AJ Sketch by Archonix | Colored and vectored version by ReFro82
Twilight's Asylum by Khan the Cake Lover
Smilight by HappySwitch
Twilight Waking Up by Dombrus
Fan Art by toxicdemon10
Asylum Twilight by Madness-With-Reason
Asylum Fluttershy and Asylum Ch 26 by Downburst-Backspace
Twilight and her Twin by v747
Birdgirl by sirValter

Readings and Videos:
Asylum Animated Trailer Video by formuladash
Reading by Gammarobot (SugarCubeRadio): All Chapters Here
Reading by Ender Brony: All Chapters Here
Reading by VisualPony: All Chapters Here
Reading by MelancholyIguana: All Chapters Here
Fan Trailer by Kaidan: Asylum FanFic Trailer Cuckoo's Nest

Sanctuary by Kaidan
Broadhoof Files: Dr. Humors by TypewriterError
Broadhoof Files: Corporal Phalanx Spear (Ret.) by Phalanx Spear
A Hearth's Warming Tragedy by Seven Fates

A special thanks to Breath of Plagues, Rex Ivan,
ChudoJogurt, Cynewulf, Death the Kid, Selbi, PrinceDolph, Blahman2816, Queue, and Gage!

Axan Zenith - Dr. Dreamer
Dratini4 - Way Finder
psychicscubadiver - Bright Mind
Velkaden - Dream Chaser
Reese - Silver Glow
Viola Heartstrings - Clover
Archonix - Spinney Whiteacre

With the Spirit of Chaos locked in stone by the powers of Harmony, a new order must be created. The spirits of Love and Harmony are given physical form, taking the names Cadence and Philomena, so that they may walk among the ponies and ensure peace reigns.

Too bad they're both terrible at this.

Sequel to Head Full of Cotton Candy

Co-authored by TheGreyPotter

After the most important night of her career is ruined and its saboteurs not even so much as punished, Octavia's life changes. She begins to pursue a path that has never been seen before in Canterlot, where concertos and rhapsodies give way to controversy and rebellion.

A path where symphonies are composed with cans of spray paint.

Cover art used with permission by LuGiAdriel14