A few good ideas include wedding reception backdrops made in an arbor style or using materials such as paper or fabric to form the backdrop. Other unique ideas include using leaves or strings of colored lights.
Nature, in the form of flowers, leaves or for an outdoor wedding reception, even a grand old tree with fabric draped over its branches, makes for an excellent wedding backdrop. Those who like flowers can have an entire wall of flowers behind them or stick with floral accents around their names, initials or photographs. An unusual idea is to nail some plywood together to form a giant board. Paint it with chalk-style paint. You can then customize the blackboard.
To achieve a very modern look for an evening or night reception, hang string lights in different colors or a single significant color. You can also use string lights in the same color to link the pews to create a beautiful path of light leading to the couple. A fun and quirky wedding reception idea is to tie strings of jute or cotton into knots of different kinds. You can work feathers, crystals, flowers and even tiny lights into the knots for added dramatic effect.
A curtain of crystals and candles is sure to add sparkle and dazzle to a day or night wedding reception. Include a crystal chandelier, hanging swathes of lace and satin, and pillar candles on the ground for a more opulent look. Fabric strips of different colors, materials and lengths provide an outdoor wedding with a sense of structure, while retaining the open and natural elements of being outdoors. Net, satin or lace in pastel colors work well to seamlessly mingle a backdrop with an outdoor setting.