As a prelude to cake and party snacks, why not send out invitations that kids can eat? Specifically, boxes of animal crackers or Cracker Jacks can make for cute invitation templates.
Simply cut out card stock large enough to cover one side of the snack box. Then, print the party details on the stock and glue it onto the boxes. It may be a wise idea to hand these out in person. You won't want to run the risk of the snacks getting broken in the mail, nor will you relish paying a hefty amount of postage to mail the invitations. But as always, remind your child to be discreet when distributing invitations at school.
Complementary Party Themes: zoo, safari, jungle, baseball, camping.