I backed the Mantic Games Terrain Crate kickstarter a few years back and received a lot of dungeon furnitures. Chests, debris, tables, chairs, bookshelves, and more.
Here are a few pictures of them, when used in my games.
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This was an old arcane library, forgotten for centuries, and under a permanent silence spell. Some of the furniture were actually mimics, and the big boulder was animated and made regular cycles around the room.
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This was on their way to the library, the previous corridor had its gravity reversed. The green shell represents a Kobold follower, IIRC.
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In another game. It really gave some depth to a bland flip mat.