Harold and the Purple Crayon is a classic kids book! And I love that this family and Grandmother crafted up costumes in honor the book! The stuffed purple crayon complete with the purple cord is the perfect prop for Harold and the Purple Crayon costumes! To make the purple crayon drawings on mom and dad’s t-shirts they first used disappearing ink as an outline. Then they sewed purple t-shirt cording on top of the ink. For a complete tutorial check out Generation T.