My idea - Each child decorate a hand and attach it to the big tree. (Make paper hand cutouts from your children's hands. Write things they are thankful for on the hands and you will build your own thankful tree!
Stained Glass Fall Leaves Craft (with template) - Mom On Timeout. What a fun project! For winter/Christmas time, maybe make snowflake templates and do the same thing? Spring --- do flowers! Just love this craft idea for kids!