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