A family member could lead the prayer service, or you could ask a pastor or chaplain to do so. Have several family members ring handheld bells to mark the passing of the individual. Bring helium-filled balloons to the service, butterflies or birds. You can release them after the completion of the prayer service.
I wrote in to Joseph Prince Ministries to ask for prayer for three things: For my daughter to find a good husband, for my son to get a job in his field and for my brother to be saved.