Tic Tac Toe
You can create a tic tac toe board and markers out of just about anything.
Turn ordinary photos into magnet puzzles with craft sticks. A small cookie sheet serves as the canvas for this project.
A black-and-white board made from hook-and-loop fabric forms an on-the-go version of checkers. Again, the idea is to prevent losing the game pieces on the floor of the car.