My favourite

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  Reflections Crystal Faire, a Flurry Heart from an alternate reality, attempts to stop the collapse of all existence. ...With a little help, perhaps. by RQK 142,861 words · 237 · 9
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  Mirror's Image Twilight never was a unicorn. And she didn't even know it. by Evilpresident 224,822 words · 3,402 · 89
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  The Enchanted Library When one fateful search through the Everfree Forest leads Rarity to a secret library inhabited by the spirit of an ancient alicorn princess, she realises that it may be time to start believing in fairy tales. by Monochromatic 337,147 words · 4,646 · 69
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  Mocha's Story "Mocha" was a human in a dangerous deadly war, now he's pony in peaceful Equestria... But the time between the end of his life as a human and the life of peace he now has as a pony was not easy to obtain. War and peace; nothing comes easy to some. by Mocha Star 81,159 words · 61 · 41
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  The Pony Who Lived Upstairs What would you do if a pony moved into the apartment upstairs? Would you make an effort to meet her? What would you talk about? And what kind of pony leaves Equestria for Earth in the first place? by Ringcaat 184,444 words · 602 · 37