It's April 1st and Princess Luna gets some help to make up for all the years of pranking she's missed.

Sweetie Belle Sings to the moon. But her song attracts an unexpected guest.

Image is by Zonra. Who is awesome.
http://zonra.deviantart.com/gallery/#/d3kv95u

Twilight finds a dusty old book full of puns and begins to use them, much to the dismay of her friends, considering her puns are slowing down their travels and they need to be PUNCTUAL.

Rainbow Dash has vanished! To save her, Scootaloo must confront her fears and sail to the land where dreams are made...

Six stars on Equestria Daily!

Luna thinks of a novel way to cheer up a distraught Sweetie Belle. Five stars on Equestria Daily!

EDIT ONE: Please also check out Singing to the Moon by the fabulously talented uSea. It's a story which I didn't even know existed until someone in the comments pointed out the similarities (I mean, seriously, that story even has some of the exact same phrasing as my own. It's eerie).

EDIT TWO: Funnily enough, long after this was published, the show itself also did something similar. I guess there's something about this pairing that lends itself to this idea?

Rainbow Dash is having trouble coming to terms with something about herself and seeks the help of her friends.

Contains ponies with non-hetero sexualities. You have been forewarned.

Silver Spoon questions why she participates in the psychological destruction of the Cutie Mark Crusaders.

Inspired by the title image by the inimitable Rainbow.
Featured on Equestria Daily - 2012/05/29 -- -- -- Hungarian Version -- -- -- Reading by the Living Library Player Society

He had wished to be a pony himself. His name was Needle Wings, and this is his story. This is a story about love, hate, and above all, how someone can overcome all odds in the face of anger and oppression.

WARNING: To those brought here from Changing Flows, please know that this story is nowhere as well written as Changing Flows.

Luna has had enough of Celestia's games, and has found the perfect means of revenge. Using a long-forbidden spell, she transforms her sister into little more than a small filly, all so she could pull the greatest prank ever. Unfortunately, she soon learns that before you fool around with dangerous magic, you really need to read the fine print...

A sequel can be found here.