Some of my favorites

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  This Cruel and Random World It was a simple bet. Spend one month as a pony, and prove to Celestia that he had been right all along. Discord never thought he would actually enjoy it. As the days pass, he finds himself desperate to keep up the façade a little longer. by Bluegrass Brooke 124,962 words · 701 · 28
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  The Tale of Lord Barleycorn The Harvest Family farm is on the brink of financial collapse. Can this 'Lord Barleycorn' really deliver on all his promises? by Blue Cultist 265,952 words · 1,478 · 19
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  Of the Hive After the royal wedding, a new changeling hive makes its presence known and wishs to open diplomatic relations. Twilight decides to use this opprotunity to learn more about them, but ends up getting far more than she bargined for. by law abiding pony 77,660 words · 3,142 · 60
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  Star Dust Twilight recieves rather late invitation from Princess Celestia for the first "Winter Solstice" celebration for Princess Luna. And while staying there, something is going to change her life... by Juu50x 72,440 words · 324 · 19