I like these stories. You will, too.

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  Fallout: Equestria - Memories One crazy pegasus, one roboleg, a contingent of Steel Rangers, and an adventure of infinite detours. Put all that together and what do you get? A rip-roaring mosh pit wrecking its way across the Wasteland, leaving nothing but confusion in its wake. by TheBobulator 386,808 words · 902 · 64
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  Fimfiction Writes Ponies! What happens if almost one hundred Fimfic users get together to write a single story simultaneously? This happens! Also Lord Apep ate the Sun, and Twilight should probably do something about that. by Obselescence 13,096 words · 451 · 33
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  Inner Demons On her 21st birthday, Twilight reads a prophesy that starts a downward spiral into her own darkness. by Azure Sandora 148,962 words · 1,399 · 129