Aside from planting a tree, starting a compost bin or creating a vegetable garden, there are lots of crafty ways that you can share Earth Day with your children. Here are some nice tutorials for eco-friendly crafts for kids:
Mosaic Bird Bath from The Seattle Times.
Tin can projects from Family Fun.
Gum Wrapper Chain from Wee Folk Art.
Egg Carton Flowers from Supercozy.
Cereal Box Matching Game from Plum Pudding.
Twig Trivet from How Stuff Works.
And here are more simple ideas for crafting with recycled materials. Really, it’s just a matter of working with what you have. Since I’ve started making a concerted effort to do this in our home, we spend considerably less on craft supplies and my children look at every object with a creative eye.
Camp Creek Blog has a nice post about saving materials for recycled craft projects here. And as always, The Crafty Crow has links to tons of great ideas for crafting with kids, like this post about things you can make from an egg carton.