Mine is either the 31140 Magical Unicorn or 31131 Downtown Noodle Shop. My unicorn set is currently built in the seahorse model because I love how stupid it looks. ❤️
I have Rivendell waiting to be built when I find room!
I liked the white rabbit set - mainly because of the cockatoo form. I also enjoyed the Balrog and Gandalf Lord of the Rings Brickheadz.
Of course, the sets I designed myself to go along with minifigures are always my favorites. For example, this scene where the orc and rocking horse girl from series 24 decided to switch places:
I'm currently building a carrot farm (for my 2 carrot guy minifigures and a farmer minifigure) and a nano scale city for my T-Rex costume guy to stomp through.