I had my 3rd grade students read Earth Day articles on Time For Kids and Scholastic websites. Then, they created a pledge to help our Earth this year. They had to site specific data from their website articles to explain the reason for their pledge.
I use these to keep track of when my class goes to specials. I glues dr. seuss pictures to them and laminated them. I use clothes pins with the day of the week to clip to them.