One of the most unique table centerpiece ideas in existence is to use goldfish bowls, complete with fish. This doesn't have to be kept for a nautical theme, either - pair the bowls with flowers or decorations in your chosen colors to tie everything together. This is a really interactive centerpiece idea, as they will keep your guests entertained and mesmerized for hours - especially the kids! No other table decorations will have quite the same feeling of movement and fun as living animals, so consider goldfish bowls if you want something really entertaining. This is a wonderful, unique idea, but you have to be prepared to take the fish home and care for them all afterwards!