M.L.
Well, this isn't a salad, but we do a cheese/fruit/veggie kabobs. We decorate a pumpkin (either carved or paint a face on it), then we stick the kabobs all over the top like the jack-o-lantern's wild hair. It makes a delicious and cute centerpiece for the table. I 'drew' a picture of it on my blog, scroll down a bit:
http://littlelovables.blogspot.com/2008/10/halloween-and-...
Don't forget the floating hands in the punch! Take powder free vinyl gloves, fill with water and freeze them. Then, cut off the glove and float it in your punch (add dry ice for a fun effect).