On the eve of Hearth's Warming Eve, as Luna raises the moon, she is visited once again by the very entity which drove her to madness. Resisting it's influence, Celestia and Luna hatch a plan to end this once and for all.
One which works too well with unforeseen consequences.
As the nightmare loses it's power, it plummets to the earth followed by an explosion of Power that the Royal Sisters know too well. However when they find the epicentre of the explosion they are shocked to see an Alicorn with no memory, and no name.

Yet the question remains. Why does it resemble Luna so much that they could be twins??

Follow the story as this unnamed Alicorn makes her presence into Equestria, for better or worse.

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

When a mishap occurs with Celestia's bathroom scale, an ancient protocol that may just doom Equestria is set into motion. With the entire palace staff now conspiring against her, the sun goddess must not only contend mountains of paper work, dancing celery sticks, and steroid pumped stallions, but a sister who will take this chance to torture Celestia any way she can as payback for her banishment. Lock the cupboards and barricade the fridge! It's the Royal Diet!

Now with TVTropes page! :http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/ASliceOfLife

Night and day. Fire and ice. Creation and destruction. Everything has an opposite, and Chaos is no exception. Princess Celestia tells Twilight the true history of Discord's rise, the Alicorns' fall, and the creation of the Elements of Harmony.

She tells her student the story of Order and Chaos.

Princess Celestia tires of constantly being surrounded by decorum, deference, and formality, and decides to take a day off from being Princess. But visiting Ponyville incognito is harder than she expects. Will she be able to fit in and make friends without blowing her cover?

Twilight wakes up with a serious head-ache caused by her horn spontaneously growing due to a sudden increase in her magical power. Nopony seems to have an answer for it, but it has attracted the attention of an unusually powerful militant foreign nation intent on her capture and execution. When a string of events lands Twilight before Celestia's father himself he tasks her and her newfound magic with tying up some loose ends he'd left behind long ago, ultimately connecting with this foreign nation's goals. With their powerful enemy baring down on Equestria, intent on taking it in a stranglehold, Twilight and her friends have little other choice than to travel the world and hunt for the rest of Celestia's family and end several thousands of years worth of feuding to prevent the war coming to Equestria before they themselves are caught.

Image Picture by Lostzilla of DeviantArt.
(find him yourselves)

Ech is a whiny bitch, but he helped edit a little I guess. (you too bats)

It is the longest day of the year, and something has gone wrong. Canterlot is in ruins, Celestia is an out-of-control god flying west, and it's up to Twilight Sparkle and her friends to save Equestria. But with the Great and Powerful Trixie playing a reckless wild card, do the girls have what it takes to set things right?

A noble earth-pony family, fallen somewhat on hard times, is killed in a mining accident. They leave behind a single male heir, who is in sore need of a guardian, and of protection. Celestia takes the young pony under her wing and delivers him not to ponies - not earth, unicorn or pegasus - but to a dragon, an ambassador, an old friend of hers.

Playing a game which may just be deadly to the uninformed, the dragon decides that the one path open to him to ensure the safety of his charge and to carry out his sworn duty, is to adopt.

Twilight and her friends are approached by Princess Luna who presents them with a set of questions that trigger a long and perilous journey.

Did you ever stop to wonder what became of Trixie, Gilda and Blueblood after your encounters? What did these episodes truly mean to you? What role will they yet play in the lives of the Elements of Harmony?

Last, are these questions as relevant as the journey towards the answers? Who will benefit from seeking these answers - you, them, or I?

When alternate universe versions of Lauren Faust and Craig McCracken living the high-tech future of a dying Earth become the victims of a raid by the Ponification for Earth's Rebirth group, their lives will never be the same. The lives of everybody and everypony else in both Equestria and Earth will be forever changed as well as Lauren, Craig, and a mysterious newcomer join the Mane Six in both trying to fit into a new life they didn't choose and discovering an ancient conspiracy that holds the truth behind The Conversion Bureaus and everything connected to them. What started with an anomaly will end with a revelation that could very well destroy both worlds.
(Seperate from The Animation Bureau alternate universe)