Prince Blueblood is banned from frolicking within the city limits of Canterlot. In an act of defiance, he strikes out to make a name for himself in Ponyville. Meanwhile, a lovelorn Big Macintosh pines for Twilight Sparkle, who only sees him as a big, dumb farmpony. Worlds collide when, with the help of some stolen Zebra magic, the poor, unfortunate souls switch bodies.
Now, Blueblood runs amok through the mares of Ponyville while Big Macintosh learns that being Twilight's Prince Charming is harder than it looks.The sleepy town of Ponyville is in for a rude awakening!

A visitor arrives in Equestria, bearing a wealth of knowledge and a troubled past. The Mane 6 are quick to befriend the stranger, who helps them to discover what they truly value in life, and how to achieve it.

But learning to overcome their fears and achieve their desires comes at a steep price, paid by their innocence.

Scootaloo gets some bad news in her early womanhood that changes her life. Filled with grief and sorrow of her past she strives to find content with herself.

What would you do, if you met a pony who was at once your brother, and yet not? Applebuck wishes to reunite with his 'Cousin JayJay', and braves the dimensional divide to reach his goal. But being a small foal, how will he deal with a world in which everything is flipped? His friends, his family, and even... himself?

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!

Humans.

Truth or myth? Ancient lost civilization or just an old pony's tale?

No pony has ever seen one, and most haven't even heard of them. But Lyra knows that these wonderful creatures are more than just old legends, and she's going to find out... and possibly drive her roommate insane in the process.

After an inexplicable explosion ripped apart the Everfree Forest, the sun that blessed Equestria and its neighboring kingdoms and city-states has evaporated, and Celestia was gone with it. Few remain upon the Earth to ponder if it was mere coincidence, or what was the royal army doing so close to the forest. A unicorn, a griffin, and several uncanny companions begin an epic journey to ask, answer, and cheat the question through will, loyalty, and pure luck: What happened to Equestria?

Twilight Sparkle believes she has made a new friend when a new pony moves into town. But when she stumbles upon his secret, she's pulled into the world of wartime Equestria. Can she use her brilliant mind to help defeat the enemies of Equestria, or will her mind fail her when it is needed most?

Not all assumptions are malicious, but even the most innocent rumours can be unpleasant, if they actually effect ponies' lives. Rainbow Dash knows this all too well as she tries to confront the stallion of her dreams. A bitter-sweet kind of hilarity ensues when she meets another pony with similar problems.
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Everyone knows Fancypants is Canterlot's most important pony - but when did he become the most important? How did he do it? And where did he begin his rise to prominence? When Rarity puts the question to him, Fancypants decides to tell her his history in a series of letters, detailing his triumphs and tribulations on the road to the top.