One Piece X MLP Crossover

A emergency trip to Zecora's leads Fluttershy to find a strange pony with a straw hat. Unfortunately, he scares Fluttershy off with his talk of eating other animals. The strange pony's arrival in Equestria sets off a chain of events that threaten plunge the peaceful kingdom into an all out war. Twilight and her friends, along with the new pony may be the only ones who can unravel the mysteries that surround Equestria and save it from falling apart.

Now with TV Tropes!

New Cover Art by Droll3

The Cutie Mark Crusaders decide they need to expand their numbers, but things quickly go awry when their first target begins sobbing on the spot. Sweetie Belle soon finds herself roped into hanging out with the young colt.

Can Sweetie Belle see past the young colts weirdness and allow friendship to bloom? Can Button Mash fake enough normal behavior to make at least one friend? Will these two hit it off, or are Button’s only friends destined to be the ones in his video games, forever?

Cover art by users Vallis and Novel-Idea

Pinkie Pie is being tormented by horrific nightmares. Unable to deal with it by herself anymore she seeks out Twilight's help, but will it have been the best decision when she finds herself alone in an abandoned, fog filled Ponyville?

Sequel: http://www.fimfiction.net/story/4676/Too-Shy-for-a-Rainbow

There have been a LOT of high-quality readings of Silent Ponyville, but this one is my personal favorite:
https://www.youtube.com/playlist?list=PLGh01rbB4o3xoSV7a6Omc-UJROXHRZ1Hv