Liturgical Go Fish
Here's one for those who have a lot of contact with children. Whether your own, or Summer Sunday school, VBS, or preschools, here is a simple way to teach children the things of the church with names. Plus the name is fun: Liturgical Go Fish.
I might suggest making your own with pictures from your churches vessels, sanctuary, and nave. What other things could you include? What other games have you come up with on your own?