Have you thought of using wedding bells to give to your guests to ring as the 2 of you come back down the isle as husband and wife instead of the bubbles or candied rice? They have a wonderful sound and your guests will love it. This works especially well for out door wedding ceremonies where the wind may be an issue.
Also something fun if holding a beach wedding ceremony: beach balls for all to throw up as the 2 of you walk out. Kids especially love them.