I love this idea!! Jenn, from one of the blogs that I follow "My Delicious Ambiguity" created gratitude cards.
"I thought it would be fun to make a set of gratitude cards with questions, crafts, activities and acts of service that we can do together to learn about gratitude and to help others in our community. In total I came up with forty-eight things that we can do as a family."
You can download these cards in PDF format at her Etsy shop.