Favourites that I throw money at

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  Rites of Ascension Twilight makes a new spell and starts the gears of fate with her ascension to alicornhood. (Writing started before Season 3.) by CvBrony 695,469 words · 3,034 · 78
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  The Mare Who Once Lived on the Moon In a steampunk reimagining of the universe, Twilight Sparkle finds perhaps the one pony as lonely as she is. It's rather unfortunate that they're on the moon. by MrNumbers 143,130 words · 2,950 · 58
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  The Moon's Apprentice Twilight Sparkle failed her entrance exams for Celestia’s school. Worse, she is a danger to both herself and others, resulting in her magic being suppressed. Dreams crushed and now one of the weakest unicorns, a nightmare comes to her. by Forthwith 412,134 words · 3,741 · 167
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  Sharing the Night Twilight becomes alicorn of the stars. This is sort of a problem, because Luna kind of already was alicorn of the stars. Oops! by Cast-Iron Caryatid 234,498 words · 3,975 · 110
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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 · 4,564 · 68