You can leave the windows naked or simply flank both sides with a simple pair of drapery panels made from a summer cotton, chintz or linen. As an alternative to fabric panels, you can flank the windows with a pair of wooden or metal shutters. With wood shutters, the more weathered and aged they are, the better. Weathered, paint chips and aging adds a lot of character to the windows. Metal shutters are available from your local exterior siding supplier and are very inexpensive.
Sheer panels are also very seasonal and have a sexy summer feel.
Look for new high fashion sheers that have been printed with a pattern and texture. To give upholstered furniture a summer make over, try slipcovers. Look for ready-made covers in canvas, denim, cotton or linen fabrics. Keep the colouring neutral, white or off white as you can always add colour with throw cushions. To give a room a real summer feel move some traditional out door furniture indoors.