My son Timmy was born on Arbor Day - April 25 2003.  His first birthday fell near Arbor Day & on Earth day weekend so we had an Earth day Party. We had the following : Recyclable Earth Day Invitations  A Bird's Nest Birthday Cake: 2 round cakes assembled one on top of the other (the top one is slightly hollowed out). I frosted them in chocolate frosting with toasted coconut (to create the look of a nest).  I put in Peeps blue marshmallow chicks (which were available-it was Easter time!) and malted milk eggs to represent the birds and their eggs. I surrounded the "nest" with Italian "leaf-shaped" cookies to simulate the nest sitting in a tree. The napkins and plates were imprinted with butterflies and flowers.  The centerpieces were seed packets imprinted with Timmy's name, birthdate & picture created with a computer & label stickers.  We also had evergreen seedlings on all the tables. Both the seeds & trees were favors as well.  We used garden toys and seed packets as favors for the children, and we gave out tree seedlings in small peat pots to the adults.  I purchased the tree seedlings from a local 4-H club, so we were also helping to raise funds for conservation programs involving children!  With older children the possibilities for earth day parties are unlimited! Recyclable crafts, park clean-up activities (which could be made into games) and lots of activities involving gardening.  Karen Pasquel