After hearing about this idea from another family in our couples' bible study, we decided to add an element to our bedtime prayers. We have each person, starting with the youngest, tell something for which he or she is thankful that day. Last night's prayers concluded like this:
The boy: Okay, dad, it's your turn.
Dad: I am thankful for...Mom.
The boy: Huh, couldn't think of anything tonight, could you, Dad?