Rainbow Dash writes an original fan fiction about Daring Do. With the help of Twilight, she submits it in a competition by correspondence.

Rainbow Dash is a headstrong, athletic pony who is utterly faithful to her friends and doesn't keep any secrets from them. Or so she pretends. Yet a surprise visit from Twilight Sparkle is about to blow the secret wide open, and the multi-hued pegasus will find out just how strong their friendship is.

Note: This story was written in the week following the airing of "May The Best Pet Win", and well before "Read It and Weep" was even known about. As such it haws since been overtaken by canon, but most folk tend to like it still so I will upload it here so I have a bit of a presence on FIMfiction beyond "lurker #347,921".

This story also includes "The Unrelated Epilogue" which is a mini-story based on a loose bit in the main one that I felt did not stand on its own, but that I wanted up nonetheless. It has Luna, but not RD or TS.
Cover image is a screencap from the show.

Finding herself with wings and unusually powerful magic, Twilight Sparkle proceeds to have breakdown after breakdown, until with the help of her friends, she confronts Celestia and Luna about it... And learns that she's a far more important little pony than she ever imagined - for all the wrong reasons.

Awesome painting by Drezzer can be found here!

20 megapixel version is here (10MB JPEG, 210dpi strangely, 24"x20")!

Thanks, man!

Twilight and her friends are leaving for a week-long vacation, leaving Ponyville in the very capable hooves of Lyra and Bon-Bon.

What's the worst that could happen?

Written for the February Write-Off.

After a brief spat with Spike over a seemingly trivial matter Twilight decides that in order to learn more about dragons she should try to become one. With a simple spell she transforms her little pony self into a larger dragon and quickly realizes that she has no way to change back available to her....

When your life is as dull a gray as the world that surrounds you, the mundanities can make it all seem meaningless. Sometimes all we need is a little color -- or six -- to reintroduce us to what truly makes life worth living.

*6-16-2017 Edit, added Rainbow Dash tag because it triggered knighty.*

Instead of being killed in the cold Antarctic by Dr. Manhattan, Rorschach finds himself rematerialized in a strange new, pony filled world. He finds himself drawn into the lives of the ponies of Ponyville but some ponies fear that this sociopath will bring danger and darkness to an otherwise peaceful existence. Will the mane 6 help Walter Kovac find peace within himself or will he bring them all down with him in his cold views of reality and existence?

As Seen on Equestria Daily!
And our TvTropes page (By Crowrob0t): http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/RorschachInEquestria

My Little Pony: Friendship is Magic and its likeness is owned by Hasbro Studios. Rorschach and Watchmen are owned by DC comics. All rights go to their normal original, intended owners.

At first glance, Princess Luna's charioteers might appear to be little more than Royal Guards dressed in festive apparel for Nightmare Night. However, there is far more to the story than that - the Night Guards once played a pivotal role in the history of Equestria, and have sacrificed more for their beloved princess than most ponies are even aware of.

Twilight Sparkle is accepted into Princess Celestia's School for Gifted Unicorns and gets a little more than what she bargained for.

Illustrated by me.

(If you object to swearing, please skip chapter 6. That's the one chapter that bumps this story straight up to a Teen rating.)