We've love the idea of eclectic collections of objects/favors that double as seating cards, like these vintage aluminum parakeet pins...
Or these vintage millinery flower seating cards (which could be transformed into stick pins for your guests by adding pin backings).
These goodies are from Tinsel Trading, but Etsy and ebay are also great online resources!
To make the strips, we just printed guest's names on text weight paper using an inkjet printer, and rubber stamped the table assignment on the reverse. Simple!