I've heard w10 northern kingdom has a collection of bushes in a room too.
I'm pretty sure that, somewhere, there's a hermit collecting all possible fishes.
With the recent addition of so many new animals, I think we should also have a way of turning them into movables for collection purposes (I don't know how exactly. Maybe patching several hides together).
Further still, there should be a counter-like furniture item designed exclusively to display things like these (for example: curios, coins, berries, weapons, skulls, parchments, etc.)
Fish, specifically, could be nailed to a board and hung on a wall: