(Set after season 4 but before the events of Crusaders of the Lost Mark)

Actions have consequences.

Even the most seemingly innocent of them have the potential to snowball into something greater.

Action: Silver Spoon confesses her unconditional love to Diamond Tiara.
Consequence: Silver Spoon gets friendzoned.

Action: Diamond Tiara and Silver Spoon play a hurtful prank on a classmate.
Consequence: Their victim loses her life in an unforeseen accident.

Action: The Cutie Mark Crusaders concoct a plan that will put an end to Diamond Tiara’s wickedness permanently.
Consequence: The course of Equestrian history is forever altered.

Ask your doctor about The Diamond Exchange. The Diamond Exchange is not for everypony. Side effects may include leaving a thumbs up, favoriting the story and leaving comments. In rare but serious cases, a small number of readers have been known to watch the author and recommend the story to other readers. Severe health risks may occur as a result of leaving a thumbs down; the most common being Lyra eating your hands.

Critics can’t stop talking about The Diamond Exchange! But since they charge for their reviews, I’ll just post these that I made up instead.

“The Diamond Exchange kept me sitting in the center of my seat.” – Maud Pie.

“The ending left me more speechless than The Last Roundup.” – Derpy Hooves after accidentally reading the final chapter first.

“I guarantee that you’ll like The Diamond Exchange almost as much as everypony likes me. Almost.” – Flash Sentry with a wink and that obnoxious tongue click sound thing.

“Yes... Crystals...” – King Sombra.

“How long is this thing supposed to be?” – Rainbow Dash

“That’s what she said!” – Pinkie Pie

“Unrequited love! Same sex pairings! Melodrama! My royal eyes have touched common fan fiction!” – Prince Blueblood

“It’s... nice.” – Fluttershy

“The lack of realism in the relationship between Diamond Tiara and Silver Spoon (as seen in The Diamond Exchange) is a minor but noticeable flaw that could easily be remedied by the inclusion of some steamy love scenes depicting the raw, unbridled passion that these two have for one another. That would be, like, so hot. Did... Did I say hot? I-I meant realistic. That would be very... realistic. You’re not going to quote me on that, are you? You are? Oh. Well, in that case, I wish to remain anonymous.” – S.S.

Cold concrete beneath my hooves. Dim light of fluorescent moss growing on the walls. Strange sounds coming from below the floor...

I don't know how I got here. I don't know how to get out of here. There's only one thing I know...

I'm so scared...

Coverart by Bootsy Slickmane, based on an original sketch by me.
Preread by Bootsy Slickmane.

It is two years since the return of Princess Luna, and Ponyville has been hit with the latest in a rash of disappearances that have stopped and started over the course of about ten years. The police are baffled, as no traces of the ponies has ever shown up, but rumors of a serial killer have been floating around the station. However, when a pony appears in the police station covered in blood, they find out that the rumors have more than a little truth to them, and that the horror stories have only started.

Link to cover art.

Twilight and Applejack have been married for two years now, so it's not surprising when Applejack gets the motherly bug to have a foal. To please her wife, and to have a foal that belongs to both of them, despite mares not being able to get pregnant the normal way (obviously), Twilight creates a spell to do the job, and it works perfectly. However, there are unexpected consequences when each one of the mane six wake up the next morning and find that they are all expecting their own little bundles of joy.

*Takes place about five years after current cannon*
*Yes, the library is the setting. I'm in careful denial of the thing ever blowing up in the first place*
*Coverart by Me, using a base from Softybases on dA:

Somehow, a mass of multicolored, repulsive ponies has arrived in Equestria. The only way to get rid of them? War and cruddy comedy.

When Sweetie Belle magically derails one of Twilight’s experiments, she finds that she and Rainbow Dash have switched bodies. While Twilight works on a way to remedy the situation, Rainbow and Sweetie try to live each other’s lives as if nothing has happened.

Which might have worked out, if the weather team hadn’t needed Rainbow’s help. Or if Diamond Tiara hadn’t decided to pick on Scootaloo.

Strange things happen in Ponyville. Foals start to disappear; their parents and siblings, struck by grief, will resort to every mean to find the cause. Some of them blame timberwolves; some blame the zebra living in the forest. Some of them even blame their fellow ponies. None of them, however, suspects a little filly suffering from insomnia...

Click here for sequels reading order, TVTropes page and other info.
Part of the New Fimfiction Starter Kit

Beware of spoilers in the comments!
Inspired by Bootsy Slickmane's Insomnia.
Preread by Bootsy Slickmane
Translated to Russian by repitter:
🇺🇦Ponyfiction.org link🇺🇦
🇺🇦Gdocs link🇺🇦
Chinese translation by MLM
Russian reading by Demicorn Masterrace

Pinkie doesn't tell ponies about Pinkamena and Surprise. The doctors said that they were bad for her, that they were a disease, but she disagrees. Sure, Pinkamena's a bit of a grumpy-pants, but she's still a great friend! She's often the voice of reason to counter-act some of the other two's crazier ideas, after all. Surprise, on the other hand, is a great prank-player, and always up for some fun. She's more like Pinkie, only more hyper. Both are great fun to be around, and they get on well.

Thing is, she knows that if she told ponies about them, then they would be dragged back to the hospital. And then be 'treated' again. None of them want that. Because of this, not even her best not-in-head friends know about them. The three of them have, for years now, been careful enough to keep the existence of Pinkamena and Surprise secret.

This has, of course, gone out the window now that Twilight is hammering on the door after overhearing one third of a conversation, with no sign of anyone else talking.

Hints of F/F shipping inside. Nothing will actually come of it here, though. Maybe in a future story.

Cover art can be found here: http://killryde.deviantart.com/art/Smile-338206490

I have always been alone in this forest. I have always feasted in this forest. I call this forest home and those ponies that travel through it are my prey. I devour all those who fear me, all who come to face me. They fear me for I am Fear incarnate. But now...I have met one who does not fear...and I am unsure of what do with her...

Image by the very awesome thewraithofwolf

Rainbolt never meant to get Firefly pregnant. In fact, he NEVER wanted to have children. Accidents do happen, though, and this one will leave the poor stallion with a sweet, daring, and spunky little filly named Rainbow Dash to raise and care for.

Cover art by the extremely talented High-Roller2108