BirthdayExpress Dr Seuss Party Supplies - Invitations (8) Includes (8) birthday party invitations with envelopes. Add matching tableware, favors, accessories, or a party kit bundle to complete your Dr. Seuss birthday party. Features classic Dr. Seuss characters such as Cat in the Hat, Grinch, Horton, Sam I Am, Lorax, Thing 1, and Thing 2. Great for kids parties, graduations, going away parties, farewell and retirement parties! Perfect for your childs birthday, sleepover or theme party!