Michael Mindes is running a Pay-What-You-Want Kickstarter campaign for his micro-game, Coin Age. The game consists solely of a credit-card sized board, and coins.
In the game two players face off each against each other, trying to gain control of the map. One player is heads, the other is tails. You gain actions by shaking coins, slapping them against the table, and counting how many faces match your side.
The best part is that the game is completely free to print-and-play. So get out there, give it a shot, and help fund the project if you enjoy it.