Year Table Numbers - photos of bride and groom at the same age as they are growing up, rehearsal dinner idea. I think I would just put AGE 8 or whatever age instead of the year though. I love looking at pictures of the bride and groom at the tables.
From Martha Stewart Weddings: Map Seating Chart. To play up a travel theme, give reception tables city names instead of numbers. Frame a large map with guest names listed near each point on the map so they can navigate to their seat.