A brief (HA!) summary of future ideas as seen in my "Future Ideas" blog post, save with certain ideas that are more likely to be used.
Don't go stealin' none o' my ideas, y'hear!
Genre: Comedy, Adventure, Crossover
Source: Warhammer Fantasy / Gotrek & Felix novel series
Premise: Essentially replacing the ever-violent dwarf Gotrek Gurnisson, the Old World's most (or least, depending who you ask) successful Slayer and his human companion, the poet and swordsman Felix Jaeger with Pinkie Pie, ever-cheerful Mountain Earth Pony Trollslayer who doesn't seem to get the fact she's meant to be dying in battle and Imperial Unicorn companion, the former dressmaker and swordsmare Rarity.
I basically do my best to follow some of the plots of some of the books with Pinkie and Rarity replacing the titular characters and replacing everyone with ponies WITHOUT the whole thing becoming a monstrous grimdark killer of dreams.
The ponies wouldn't be actually acting much like the character they're replacing. For example, if Applejack took Snorri Nosebiter's place she wouldn't become brain dead and have nails in her skull or if she replaced Ulrika she might not become a vampire. This includes Felix's love interests not being Rarity's.
Plus I'd likely make up an excuse for the rest of the Mane 6 to tag alone after first meeting Pinkie & Rarity.
The list for replacements is as so far:
Pinkie Pie - Gotrek Gurnisson.
Rarity - Felix Jaeger
Twilight Sparkle + Spike - Max Schreiber
Rainbow Dash - Kat
Applejack - Ulrika or Snorri Nosebiter
Fluttershy -....I have no idea. I'll re-read the books and see where she might fit or I'll just shove her in anyway.
The Great and Powerful Trixie - Greyseer Thanquol
Prince Blueblood - Emperor Karl Franz (not seen in story but the leader of the Empire and thus explaining why Equestria would have so much trouble going on. Blueblood would be a terrible Emperor.)
Discord - Tzeentch or all the Chaos Gods.
Chrysalis - Slaanesh
Tirek - Khorne
Grogar - The Horned Rat
All in all, it would be very silly and something written to amuse myself.
Dash Can Smell Your Cider!
Genre: Comedy, Random
Premise: While stuck on the night-weather shift over Sweet Apple Acres, Rainbow Dash catches a whiff of the Drink of the Gods - Sweet Apple Cider! She finds Big Macintosh, a barrel on in hoof. He refuses to let her have any but Applejack is awoken before answer can be extracted.
But Rainbow Dash can smell the Cider, and she's not about to give up! If she has to move heaven and earth to have that Cider, nopony will stand in her way! And so an epic clash- well, Rainbow Dash stalks Big Mac and demands he give her the cider while other ponies completely misunderstand the situation. Yet why does Big Mac not simply explain why Rainbow Dash is following him? The coolest mare in Equestria is going to find out the real secret of the Cider, and dammit she is going to have that delicious barrel if its the last thing she does!