Place Furniture.xnb into Stardew Valley\Content\TileSheets folder and overwrite.

Full list of items replaced and their replacements:
Birch chair Toliet
Birch end table Sink
Birch bench Bathtub
House plant1 Jack n' a box
House plant2 Toy truck
Wizard couch Doll house + paint stand
Modern Dinning table Pool Table
Stone slab Arcade machines
Red rug Bear skin rug
Manicured pine Grandfather clock
Small plant Abigail's game console
Table plant Shane's game console