Bird cages come in all shapes and sizes and can be used for so much more than housing birds. Another creative way to put them to use is to place some pillar candles inside and use them as a lovely centerpiece for your outdoor table. Use several candles of different sizes to create interest or just one extra-large candle.
If you don't want to use lit candles, you can add some interesting trinkets or make a themed centerpiece. For example, a nautical theme with rocks, shells and starfish with clear lights inside or strung around the outside of the cage would be an extra-sparkly addition to your nighttime outdoor tablescape.