Description from StarryOak at source:  
MASSIVE SPOILERS FOR IRONY OF APPLEJACK: A WARM HEARTH. (SPECIFICALLY CHAPTER ‘ENCORE’) , ADVENT OF APPLEJACK AND THE IRONY OF APPLEJACK  
IF YOU HAVEN’T READ THAT YET, GO AWAY FROM THIS PAGE.  
IF YOU HAVEN’T READ IT YET, READ IT. ITS AMAZING.  
*HERE IT IS, READ IT!
 
The Irony of Applejack is made by Mister Friendly. Who is amazing and writes incredibly well despite apparently coming up with the story idea while drunk (btw now the best thing to come out of someone being drunk since forever).
 
OK, with that out of the way, I’m going to assume anyone left now is totally ok with spoilers for a series they haven’t read/already has read this amazing fanfiction and now is ready to read this description.  
The Irony of Applejack is one of the many ‘What if X was a Changeling’ stories, with a twist; Applejack, first of all, never knew what she was her whole life, and second, she isn’t just any changeling drone. She’s a Changeling Queen.  
Things escalate from there. It’s a story of intrigue and fighting and lore and fighting and the power of love to conquer all, including your own nature.
 
Ironic Appledash, the only Appledash I 100% am behind, have two daughters in canon, only mentioned in ‘Irony of Applejack: A Warm Hearth’s epilogue, with no description of what they look like, so I asked Mr. Friendly himself.
 
“Summerfree and Rainbloom would be entirely deerlings in the same style as Applejack, though their other mom is Rainbow. I’ve always though of Rainbloom as having more colors in her mane and wings, but less than Rainbow, but Summerfree is the more adventurous of the two. Summerfree also has colors closer to Carnation.”
 
I worked on that, though Rainbloom came out looking a bit more like a little shit than I intended, and Summerfree looks more like Carnation in personality, but looks can be deceiving…  
Summerfree’s eye color is Rainbow Dash’s, and Summerfree’s is Pear Butter’s, I used Bright Mac’s hair color for the top of Summerfree’s mane and Pear Butter’s for the bottom of her mane.  
I also used colors in Rainbloom’s mane from other ponies. Having her mane be 3 colored and with important ponies to Applejack being featured. Like, red from Big Macintosh, orange from Granny Smith’s neckerchief, green from Grand Pear’s neckerchief. Rest of Summerfree is a saturated mix of Carnation and Applebloom’s colors.
 
Really thought I’d have more to say about this…  
Here’s their color schemes!
 
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Uploaded on your behalf, Starr!