The Giving Tree by Shel Silverstein remains a favorite book from childhood for many. It's a poignant story about friendship and appreciation and is a great book to revisit around Thanksgiving.
Tali of Growing Up Creative led her daughter's class in creating this real life Giving Tree while reading and discussing the book with the children. Each child drew a picture and then encased it in a recycled soda bottle and tied it to the tree. You can incorporate this idea for your kids (you don't need a whole class). Spend a morning writing down (or drawing pictures of) things we're thankful for and then hanging them on your backyard tree in the afternoon. You could even start the project now and save the bottles for hanging on the family Christmas tree. Check out Tali's post about her Giving Tree here.
Image: Growing Up Creative