photos courtesy of Restoration Hardware
Structures such as gazebos, trellises and pergolas add some architectural interest to your outdoor room, much the same as moldings do inside. Adding an outdoor fabric to these structures softens the wood or metal and adds some color.
Lighting - garden lights, candles or a mix of the two can give your yard a warm glow and extend your daytime enjoyment into the night. With the variety of lighting options from easy to install light kits to solar lighting, you can create ambiance in your own back yard. Candles can be used from floating tea lights to pillar, there are numerous ways to incorporate them into your décor. There are many decorative candle holders that fit in with themed décor or blend in with your landscape.
Outdoor fireplaces - not only extend the hours you can spend outside, but can also extend your season outdoors. There are many different styles to choose from; you can even build your own fire pit.
Fabric - outdoor fabrics have come a long way over the years offering a lot more than the usual awning stripe. You can use these fabrics for pillows, to cover cushions, make tablecloths or even be used as outdoor curtains.
Furniture - your outdoor rooms are a great place to use found furniture pieces. They can easily be freshened up with some spray paint. Metal baker's racks made great vertical storage and also help break up all the horizontal surfaces. Don't be afraid to bring pieces from the inside out for the day - just bring them back in at night.
Pillows - pillows add softness to your chairs and benches. How inviting a cushioned chair looks for reading a book or just sitting quietly.
Outdoor area rugs - Define the seating areas, just like they do inside your home.
Many things that you use indoors can be recreated outdoors. You can use mirrors, lighting, pillows, candles, statuary and plants. If it's not welcoming or comfortable you won't use it, just like the living room with a "hands off" feel.
Finding a table that suits your needs is a good place to start. A round table helps to break up the straight lines of many backyards. In addition to any chairs you get with the set, it is always a good idea to have extra seating. This can be in the form of larger chairs, a bench or lounge chairs, all with cushions. Small side tables suitable for outdoor use make it easy for placing a book or drink on.