Did you come up with any ideas? There are lots of great ideas for easy and not-so-easy crafts at
www.familyfun.go.com
Have you thought about having the middle school art students do face painting? We have done that at several different functions and the kids love it. They could do some basic V-day pics on the kids for $1 or so.
Hope you came up with some ideas. Sorry I didn't see this thread sooner.