To decorate a Christmas living room, start by hanging up a few strings of lights around the perimeter of the room. You can use either white or colored lights, depending on your personal preference. Next, place a Christmas tree in the center of the room and decorate it with ornaments, garland, and tinsel. Finally, add some Christmas stockings to the fireplace mantle, and place a few festive wreaths on the walls or doors. Don't forget to put out some Christmas-themed decorations such as snow globes, nutcrackers, and Santa figurines to complete the look.