Based on the song 'I am Octavia' by ElieMonty and Nowacking. You can read this without hearing the song, but I strongly suggest listening to it because it's just beautiful and it'll give you a little more background for the story.
I am Octavia <--link for your convenience.
Octavia has had enough. Enough of the selfishness, enough of the hurt, and...maybe enough of Vinyl Scratch. After telling her she was going to miss her concert, again, the earth pony calls their friendship off. Now, it's up to DJ Pon3 to let her best friend go or fight tooth and hoof for their friendship. But with everything getting in her way, will she be able to make it? Or is one of them going to need a new place to call home?

Octavia and Vinyl had a happy life together. But even Vinyl isn't immortal. Death reaches us all, and Vinyl's death hits
Octavia hard, especially at Vinyl's funeral, the last chance she will ever see her love again.

Octavia: Prodigy. Virtuoso. Artist.

And, no matter how much she wants to deny it, Pie.

I miss you. Please come home. I'll be waiting for you.

Originally written for Equestria Daily's Writer's Training Grounds #3.

Cover art swiped from Spittfire Art.

(Takes place in AU during "To Where and Back Again, Part 2" for obvious reasons. Idea inspired by LittleshyFiM.)

When Thorax stops holding back and starts sharing love, magic is unleashed that causes not only the changelings to change but Starlight as well. In fact, the magic ends up changing her species completely.

To the shock of everyone, Starlight Glimmer is no longer a pony. Now, she is a changeling, and the queen of the changelings to boot.

Overwhelmed with this sudden change and the responsibilities that come with it, Starlight must quickly adapt and try to be a leader for her new hive. And this includes what to do with the former queen, Chrysalis.

Lyra Heartstrings wakes up early to the sound of thunking outside her door. When she answers it, she finds Vinyl Scratch trying to deliver her the wrong mail. What's even stranger, Vinyl had Derpy's cutie mark! All five of Lyra's friends have been cutie-switched. They're not themselves anymore. Lyra has to find a way to fix this mess!

Based on this post: http://magicalmysterymod.tumblr.com/post/44124806183/magicalmysterymod-au-with-the-mane-background the concept is all this person's!

Oh, and Octavia is a main character too, but I can only mark five characters and there is not 'mane six background ponies' one :(

Ditto, a changeling from the attack on Canterlot, is flung far from her home and lands in Ponyville. She crashes into Twilight's library, and finds it a nice place to stay, quiet, abandoned, and peaceful. Until, of course,Twilight returns from Canterlot and finds her.

How will Ditto survive? She is lost, hungry, and far from her swarm.

Will the ponies find it in their hearts to help this poor, injured creature?

(Special thanks to Teapartycannon, who's story, Smoke and Mirrors, inspired me.)

Note: This story is no longer under revision, but there will still be a few spellchecks and such :)

After the disastrous invasion of Canterlot, an injured changeling wakes up near a small cottage and is quickly discovered by two of the last ponies she ever wanted to see. Now, with the help of her new "friends," she has to remain undetected in a town high on changeling hysteria that would not hesitate to throw her in the Canterlot dungeons should her true nature be revealed.

Simple, right?

Too bad she couldn't have picked a worse form to stay inconspicuous...

Many thanks to ZuTheSkunk for the cover image!