I know I'm not the first to think of this, but I couldn't resist. (Because, after all, resistance is futile!)
To you and me, they are the little ponies.
To the Borg, they are Species 14864.
Resisting assimilation is futile ... but the Borg have never seen unicorn magic before.
This story has been added to the "Other" folder of the group Star Trek Ponies, and to the "Hard Scifi (space travel)" folder of the group The Sci-Fi Ponies.
This story was also posted to fanfiction.net under the same title.