I haven't had my steward build anything yet, but from what I've heard, they love to put animal heads all over your walls.
Stewards will put in everything there is an option to make, including trophies heads on the walls. IMO, there is overcrowding if
everything is built or furnished! I made all my own trophies. I like the bears, sabrecat, wolf and elk heads (I am a Nord after all, lol). I even eventually put up a mounted mudcrab (they're small ones) and a slaughterfish, to fill in a couple blank spots on walls, but I drew the line at mounted goat heads and horker heads! Horkers are ugly, and the goat heads just look like a terrified barnyard animal!
To me, if you let the steward furnish your house, it will look exactly like everyone else's, and there is enough of that already that we can't help.