Based on the world of an aquentice of mine, these stories are focused around the Changeling city of Galeed, with the changeling Mirror as one of the protagonists.
The city is a dangerous place for both the changelings and the ponies that are their slaves and food, for with Chrysalis' loss in Canterlot groups of changelings are now trying to topple her throne. As a result her own troops now enforce swift and brutal law, and one does not wish to be mistaken to work for the wrong side.

There is no set storyline at this moment, just a small collection of stories from this setting.
Original mind of the setting: wandering-reflections.tumblr.com