I used the starfish as my placecards. I bought them from:
Shell Horizons - Starfish,Shark Jaws,Dried Fish,<br>Seahorses.
This was the cheapest place I found them. I just checked the site and they are out of stock right now for the ones I got. I got the 4-5" ones (they do have the smaller ones available). They are measured from leg to leg, so they are smaller than you would think. I was really happy with them.
Here's a pic of my placecards. I also had starfish tea lights on the tables, so the pic includes those. (my tables were named after places we had been together, so that's why you see the Yosemite name)...