Raise your hand if you ever had some of those green, plastic army men when you were a kid. *raises hand*
Though I never had many of them. I did have a lot of other various army men toys (such as G.I.Joe). My friends and I would play all the time, occasionally coming up with rules for how they'd work. Well, now Space Tavern Games has posted up their rules for using Army Men. The game is called Army Men: Full Force and Effect.
The game is designed to be quick to play and easy to learn. And you can pick up models for it at just about any store. Add to that, the rules are free to download. So why not go download a copy and just read 'em over?