Like Shepherds Hook idea with hook put in terracotta pots and weighted (a bit). Def would include lanterns and migrating flowers. They could be used on either side of aisle and then moved to room corners for reception.
Fall time is adorable! Colorful leaves, sunlight, freshness in the air and sitting next to the fireplace – these are my associations with this time. Another association is cozy and bold autumn weddings that really inspire!