Martha Stewart Weddings, Summer 2003
A place card needn't be on a table to be effective. To make, cut two slits, slightly narrower than the ribbon, in a flat card. Fold the ribbon in half, and loop it around the chair, as shown. Then slip one of the loose ends through the slits in the card.
Return to Clever Places for Place Cards

make sure your text is large enough so people can see it! particularly if you have an evening wedding with low light, and/or older people who not only will not be looking for a place card there, but will not be able to see it as well. Also, choose wisely on your font. This image actually proves my point. i'm 40 and I would be with my face down there looking like a dork trying to read the name on the card...
I was only thinking of doing something like this yesterday for my own wedding later in the year, but wasnn n n n n n t sure how it would turn out. Great to see an example. I am definitely doing this now!