Taking a vacation in a nice relaxing and peaceful country? That's good.
Taking a vacation and being blamed for the the theft of some very important jewelry? That's bad.
Taking a vacation and becoming public enemy number one? That's really bad.
Taking a vacation and being hunted by adorable pegasi, unicorns, and ponies? That's... different.

A mage decides to take a respite in what he assumes to be the peaceful and safe land of Equestria. Unfortunately he's accused of stealing the "Elements of Harmony", a powerful set of magical regalia, and goes on the run from the law. Now stuck in a land of magical ponies, cut off from his only way home, and now the most wanted creature in Equestria, does he have any hope of proving his innocence and going home?

Maybe, but let's laugh at him as he gets beat up by cute equines!

If you came to hear a story, I’m sorry to disappoint. I suspect this’ll just end up as one big confession, really. When you’re the first Teutscher to set hoof into Equestria, I suppose that’s to be expected. And when you’re the universe’s favorite chew toy, doubly so. Still, with enough wit, some Prussian ingenuity, a droll sense of humor, and wanton murder, I might just survive this. Then again, when you’re going up against an unending list of things like government conspiracies, that guardian angel who keeps telling you to kill ponies, psycho Equestrian girls with allophilia, a lunatic princess, the legions of the Inferno, the Equestrian culture itself, swashbuckling sword fights, and laissez-faire economists, you begin to realize why there’s a big “if” in the middle of your life.

Your thoughts/critiques/deathreats are welcome in the comments. Spoilers are also encouraged. If you don’t have anything to complain about, do please tell me what you liked so I know what worked.

Now on TV Tropes. Posted on the Equestria Daily 5/28/13. Now in ePub format for your convenience.

Be Awed and Amazed by the tale of Sweetie Belle as she traverses the multiverse in search of her lost mentor and friend, Twilight Sparkle! Will she find her in post-apocalyptic Equestria? Or maybe in a strange world where everypony is the wrong gender? Or even where a Pony claims to be a human? Read as she journeys through very familiar worlds you might have read about... if you dare!

At this point in time all the main worlds to be visited have already been chosen. Thank you all for the suggestions, and I hope you enjoy the surprises!

Here's the official TSC:F Music Intro: The Sweetie Chronicles: Fragments

WDTP: S2/3-CE
You can also visit the TV Tropes Page which has spoilers!

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

Pandinus Imperator (You can call him Pan, he won't mind) is knocked back in time during the Canterlot Invasion, and accidentally kills King Sombra on arrival. Instead of being executed, the changeling is surprised to find himself being hailed as a hero, and is promptly put on the throne as the new monarch, the Crystal Emperor. However, Pan now faces a great many problems, among them Celestia and Luna, who seem certain that the changeling is secretly up to no good, as well as several political factions secretly plotting to undermine his reign. There's also the tiny problem of the constant snowstorm that threatens to cut the city off from the outside world permanently.
The Crystal Ponies need a hero now more than ever before. Why did they get a changeling instead?

We Has A TvTropes.

While not truly a part of Bucking Nonsense's Changeling-Verse, the same rules regarding changeling abilities and society apply.

Cover image provided by gabapple, used with permission.

A former pink pony finds herself in a new, hostile world and a new friend who's perhaps even more hostile. A small, angry man finds himself with a new friend he didn't want. Can they make it through this new misadventure together, or is it the universe that needs to watch out for them?

Cover art used with permission from Technaro.