they usually use base games items added to the pictures the plants at the fire place are base game the wall paper is recoloured probally used the fabric pattern in create a style the vase on the table is a base game item so is the palm i think that one is called perma palm so is the fireplace 3 piece set
start up your game go to buy mode sort by function decor that way you can see every painting and sculpture available to you all in one area, along with other miscellaneous decor that may have gone unnoticed so if you click on the plants you should see that one at the fireplace once you find it you can recolor it yourself check for the sconce's in again by the sort by function-lights
edit to add the plant is the plants at the fire place are called tigervine the potted pink one is the mordern orchid the companion set for the fire is called the decortive fire tools the sofa is called the afforadable sofa... i suspect the gold wallpaper is from late night i'll have to check in game though