The unity candle ceremony is one of the most well-known alternative unity ceremony ideas and is a very romantic wedding ceremony that offers so many opportunities for you to make it unique and personal to you. In it you can include your family as well, and the lit candles in a dull room will look beautiful.
The couple each has a candle, and there is a third, main one between them. This main candle is lit, perhaps by the father of the bride, (or by all of the couple’s parents at the same time?) and then the couple light their own candles from it. Then the rest of the family can light their candles from it as well.
Alternatively, perhaps the couple could light each other’s candles, and together they light the main one (that the rest of the family lights theirs from). The merging flames will show their unity and strengthened love and shared lives.
This ceremony is very flexible, so adapt it and use whichever symbolism works best for you.