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Most candy buffets I've seen, all seem to be pretty empty. You can try to keep the cost low by adding fillers in between the containers such as flower pedals, or Christmas balls inserted in hurricane vases. You can offer smaller selections, however try to sort it out on a small tables instead of a larger table.
Play with fabric, mix and match things to make it visually appealing. Another way to fill in the spaces would be to add photographs of your family's weddings or your engagement photos in between the containers. You can also insert a menu of the candy bar selection in the frames. Candles are also nice, but make sure you place them in a way that people can reach without burning themselves.