Carnivores horror idea involvin g the tropy room.
Everyone expects the trophy room to be completely monotone and straightforward; the entire area only ever exists to display the dinosaurs you've picked off from your previous hunts. The wind whistling is the only ambience you'll ever hear and will be occasionally interrupted by footsteps as you move around; nothing else, nothing more. The place doesn't ever stray far from it's purpose and it's name...but what if it isn't?
It's because of the dullness and silence that people couldn't think of something happening at all, and so, this fact that they've grown used to, may as well be used against them when something suddenly does actually happen. It's up to you guys really, either one of the dinosaurs displayed suddenly moved an inch or changed in their pose unlike the others that are frozen, or that the maze-like appearance and style of the trophy room ,slowly but gradually, gets bigger or the structure of the map has hidden rooms which lead further and further into more confusing and interesting rooms.
This idea came from my own personal experience navigating the trophy room and for some unknown reason, getting unsettled by the sheer silence and lack-luster features of the map.