In an effort not to clutter up my page with random bits of half decent stories, I'm going to just have this one story contain all speedfic and one-off story ideas. I'll add them as chapters, and include a short description about them, so the reader knows what they're getting into. These are going to be pretty hit or miss in terms of quality, so here we go.

The Rainbow Menace Strikes! - Conversion Bureau speed-fic set in 1952. Takes after Invasion of the Body Snatchers, more or less.

Bad Batch - A man with a grudge drinks the wrong potion and becomes an abomination fueled by vengeance!

News of a new world across the sea has reached every corner of Equestria, and Princess Celestia has called for a massive exodus to this new land to help its inhabitants with any sort of aid. The most radical of such aid is the Ponification Potion that will turn the downtrodden and diseased creatures into happy and healthy ponies. Hundreds of Equestrians have answered this call, literally leaping at the chance to help those in need. Shimmer Sprite is one such pony, and before the week is done she will learn that sometimes the best way to help somepony in need is to leave them alone.

Another Speedfic I wrote. This one's limit was three hours, so it's a bit short and nothing really happens other than dialogue. The prompt was "A Train to Somewhere" if I recall correctly. Anyway, the scene is the Mane 6 on a train headed to Salt Lick City and discussing what they'll be doing once there. Originally it was going to be the Mane 6 playing poker while going to Salt Lick, but I think I would have run out of time before it was finished.

The Mineral Springs Campgrounds. They have long been considered by pony kind to be a natural wonder that evokes feelings of awe, beauty, tranquility, and the faint taste of salt in one's mouth. But for three fillies, this charming spring evokes another feeling all together...TERROR!
IT CAME FROM BEYOND THE STARS, TO DO...uh...STUFF!
NO PONY KNOWS WHAT IT IS! NOT EVEN ME!
Prepare for a (kinda) THRILLING tale that will leave you QUAKING with FEAR! (It won't.)
Can you face the HORROR that is...THE SLUG-MAN OF MINERAL SPRINGS?! (Yeah, you can.)

I think this description is better than the actual story.

Two months after the events of Yellowstone, Wild Magic from Equestria has run rampant throughout the rest of the world, resurrecting ancient horrors from around the globe. Mysterious and terrible monsters of myth threaten to exterminate both mankind and ponydom! With the blessing of Princess Celestia, Twilight and her friends reunite with Agent Hawk and his team to combat this new terror before it destroys the world!

Description: Two years after the camps opened up, the Western Territories of the USA are nearly vacant. It is once more a frontier, ripe for exploration and settlement. On bequest of Princess Celestia, Twilight Sparkle is to experience the human world by joining a family of Pony Settlers on their journey out West. It's Dangerous to go alone however, so in an act of good will, the US government is sending someone to make sure no harm befalls the ponies.