Turn Milk into "Plastic"! - great science experiment to make plastic! (See comment by "Ben" for actual science explanation)
Make an embroidery hoop and lace DIY baby mobile tutorial without any craft skills.
blackout poetry examples - could photocopy pages of books of various topics & genres, then ask students to create poetry or summaries by blacking-out words
Earth- Handprint & Photo Keepsake A lovely salt dough keepsake to do around Earth Day!
Pop-up book, by Stockholm based artist Hale Güngör Oppenheimer
Planet Earth - Lift-the-flap printable template FREEBIE. A nice simple Earth Day project.