Kubb is a game that is about 100 years old. It is a game growing in popularity and played on beaches and village greens across the World.
It is a team game, it is a magnificent game which will return its investment as a lunchtime set. Teams can be as small as 1 player.
The rules are here:
http://en.wikipedia.org/wiki/Kubb
Its a game of filth and strategy – perfect for the playground.
The Grinch Manifesto 
looks like a fun game, I must get myself a set.