Weddingbee boards

I agree; games are always a hit (Clue, Cranium, Scrabble, Pictionary... -extra-fun w/a large presentation-sized paper pad and markers)

Other suggestions:

- Digital camera/disposable cameras to take pictures... maybe w/a collection of fun hats and props.

-  Decorate picture frames (Michaels has small inexpensive wooden frames -around $2/ea.) w/sequins, feathers, foam shapes, etc. (nothing too messy!)

- Decorate their own cookies/cupcakes

- Scavenger hunt

-  This may or may not be a possibility depending on the noise-level & set-up of the room: having one or two portable DVD players/Laptops for movie viewing.  (You could even have some comfy big pillows to sit on and a small table or decorated milk crate to prop the DVD player)

And my personal favorite... -- http://www.educationhttp://puzzlemaker.discoveryeducation.com/  

Make your own wordscramble, cryptogram phrases, wordsearch, etc. for free w/the "Puzzlemaker" (there's an ad for a CD-Rom, but what you need for the basic activities is free on the website).  You could have personalized word-searches for the kiddies :)  

Hope this helps!