Throughout all of history, one concept has kept both the written and spoken word from becoming an unintelligible mess. That concept is that most holy of grounds known by some as "grammar." It sets down rules for language to follow, and keeps it free of distortion.

Yet something is wrong. The rules are failing. And only one pony so much as suspects that something is wrong. Something that goes deeper than a simple appearance of errors. Something that could be an attack on the very root of language itself.

Celestia and Luna were born as unassuming foals in troubled times. But already marked for greatness, the simple earth ponies stand to face a world set against them, full of danger, fear, and sadness. A world they will change forever.

A sweeping epic taking place before Equestria was made, where Celestia and Luna must rise from normal foals to become the Princesses we know them as, beset from all sides by monsters, other ponies, and even the forces that govern nature. Their tale is as tragic as it is triumphant.

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(Cover and internal art by Madmax)
(Editing credit predominantly Lightside Luc)

After an unfortunate incident involving Rainbow Dash and herbal tea, Fluttershy wakes up one morning to discover that she has turned into a rabbit! With her friends unaware of her plight, Fluttershy must turn to Angel bunny to guide her on her quest to restore her original form. In the process, she is given the oppurtunity to experience everyday life in Ponyville from a whole new perspective, and discovers that there is much more to her friends' pets than she ever expected.

Cover art here if you'd like to compliment the artist: http://mischieflily.deviantart.com/#/d4wfix3

Twilight Sparkle, Celestia and Luna are transported into a strange alternate Equestria, the Land of Always Summer, where the day lasts forever and a terrible queen rules with an iron hoof.

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Twilight becomes alicorn of the stars. This is sort of a problem, because Luna kind of already was alicorn of the stars. Oops!

TV Tropes

The Mane-Event, a popular stage show in Manehattan, has acquired a rare creature they intend to use as part of a new act. Their typical animal handlers prove inadequate for the new job so they invite Equestria's best to be the caretaker-- Fluttershy. Moving to a new city requires the inconvenience of finding a new place to stay, however. What fortune that Trixie, one of the primary acts of the Mane-Event, just so happens to have free space at her apartment.

And then the Element of Kindness lived with the Element of Egotism.