We've been pondering this too. There's so many themes for this that we can have, its just a case of wittling them down.
I must admit at the past few weddings I've been to, table numbers were an issue for some people..You could hear them whispering 'ohh I'm at table 9' and 'ohh Im at table 7' and so on, it was almost like a competition and I don't want that happenening at my wedding. Why do people think that there is an alterior motive to table numbers? It baffles me! :/