You don’t need to know how to knit or crochet to make this scarf. They use drinking straws as a kind of loom for yarn. If you are going for the Harry Potter look for a costume or whatever, choose maroon and school bus yellow for the yarns. Choose other colors for a different look.
I’d rather knit a scarf, but you might like this method to making a scarf.
Click title for link at Instructables.