Plants can serve as functional design elements. Many homes in today's suburban neighborhoods have great rooms. While most homeowners love the idea of a great room, it can also be a curse; it's hard to know where one functional space ends and the next one begins. Large indoor shrubs or trees are the perfect solution. Use them as room dividers or to flank an area to create a more restricted passage. By using a plant for this purpose you infuse life into the space and avoid making the divider feel too heavy. If you're daring, place a potted tree in the middle of large open area to create a soft room divider. The sheer size and shape of this potted tree adds a real punch to this interior.