I have to admit, this is my favourite free event we do for Sailing with Scissors. All you need is a medium (or larger) wood mount stamp that is new or slightly used. During the game, your stamp will be shuffled around until it ends up in a happy stamper's good home. At the same time, you receive a different stamp that will get those creative juices flowing when you return home.
I received a really cool retro snowflake stamp last year that I'm using on my Christmas cards this year. You can see the stamp in the middle of the picture. I love it.