The furniture in your room doesn't always have to be placed against a wall. Floating furniture in the middle of the room room can sometimes better utilize the space you have, highlight a focal point such as a fireplace, or cozy things up. Placing furniture on an angle can really give the room a new look and make the space feel more open and welcoming. This method fills in dead space, keeping the room from looking boxy.
Above: Sofas placed on an angle with chairs floating in the room say "welcome, have a seat."
A lovely loveseat and 2 chairs share the spotlight with the fireplace.
Left: A sofa is placed in the center of a room facing a fireplace. Look at how cozy this room is and it uses every available inch of space. Right: Both the sofa and chairs are floating in this room, sharing the view of the fireplace while keeping the space light and airy. all images unknown sources.