Download a series of Halloween themed game boards for practicing counting and one-to-one correspondence.
Here's a simple idea for using LEGO blocks to count. Students move around the board adding or subtracting blocks from their tower. At the end of the game, players count how many they have and the player with the most wins! (They can also compare towers by length.)
Great list of what kids are learning when they are playing board games. List of must have games too.