When Lalna's thumb slips while holding the remote to the nuke under Rythian's castle, the explosion opens a portal. A strange, swirly, rainbow portal. It takes them to Equestria, and leaves them there as ponies. Will they learn the magic of friendship, or strangle each other before they have the chance? Is this just some cruel joke for Princess Luna's entertainment? The world may never know...
Takes place in my Rainbow Dash and Vinyl Scratch universe, but before Feelin' Princessy.

Takes place during The Game of Life
Vinyl Scratch has been feeling pretty down after Rainbow Dash's death, so she seeks out the help of the alternate universe's Pinkie Pie. After all, no one can make a portal to bring back the dead like Pinkie. But portals like that can be very unstable, and you may not get the results you wanted.

Crossover with the book series Warriors, Power of Three, book 5.

Cover image base: Link

Rainbow Dash and Vinyl Scratch have returned from the alternate universe, to find themselves still alicorns. And for some odd reason Twilight is an alicorn too... But a short time after their return, Rainbow Dash is assassinated. At the doors of death, Rainbow Dash is given a second chance. All she has to do is roll a dice to determine her fate. After being convinced it is not a scam, she hesitantly accepts.

I have no idea how this is going to turn out. I'm not particularly good with this type of story, but who knows. Rated P for PONIES
Sequel to Feelin' Princessy
Cover art pictures:
Rainbow Dash
Vinyl Scratch
Dice
Based off of this PMV: Link

Sequel to "Two Best Friends Play..."
Rainbow Dash and Vinyl Scratch somehow get sent to an alternate universe, where they are princesses instead of Celestia and Luna. Tyranny. Tyranny happens.
Links to pictures used for cover image:
Rainbow Dash
Vinyl Scratch
35 followers special!

When Celestia tells Luna she can't invite a bunch of her friends over for a Let's Play, Luna decides to do it behind Celestia's back. Can she enjoy a Friday night with her gaming buddies, or will Celestia find out?
Luna's Let's Play guest list:
Discord
Princess Cadence
Lyra Heartstrings
Derpy Hooves
Twilight Sparkle

Luna meets Wheatley while she is on the moon.

After Ponies and Creepers Don't Mix and The Ponyville Griefer, Rainbow and Vinyl start to play video games together... Which is surprising since they were sucked into one... And Rainbow was killed in My Little Portal... And is somehow still here...
THERE IS LOTS OF FUN TO BE HAD!

Based off of My Little GLaDOS.
Sequel to My Little Portal 2 - Celestial Science. GLaDOS once swore she would never open the folder named 'Project Equestria', but desperate times called for desperate measures. GLaDOS and Wheatly are now ponies with the CMC, and have to live in Ponyville without Aperture Science. What could go wrong?

Sequel to My Little Portal- Friendship is Science.
Fluttershy is the last of the mane six, and before she dies, she hears something terrible. A new place called Celestial Science is being built in Canterlot. Such a shame the mane six wont be there to stop it.
Wheatley now has to help the mares who were once the Cutie Mark Crusaders escape, or help them get revenge.

After the events of Portal 2, GLaDOS takes up a new hobby. Testing ponies.
Pinkie Pie breaks the Fourth Wall, bringing them to this universe where ponies are tested at Celestial Science. Will they survive testing and make it to the cake? Oh, and Chell is here too!
I am not as good at Portal, as I am at Minecraft, so let's see where this goes.
P.S. You need to have played Portal 1 and 2 or you will be incredibly confuzzled!