I have 4 daughters from my first marriage. My fiance and I were brainstorming ways of incorporating my daughters into the ceremony - aside from being part of the wedding party (as they already are).
I have heard of a sand ceremony (each of the bride and groom and the children all have a different colour of sand and part of the ceremony is to mix the colours together in a glass vase or fancy container to show the unity of all becoming a family).
I have also seen the addition of rings for each child given by the groom and/or the bride.
What other forms ceremony inclusions have you seen to include children of a previous marriage into the new marriage?