Cookie decorating not for beginners

The Kitchn just posted a list of 18 Harry Potter-inspired Halloween recipes. I can resist most of these ideas (they're very heavy on pumpkin and butterscotch flavors, neither of which are my favorite), but I am in love with the Weasley Sweater cookies idea. I would make those in a heartbeat, if only my cookie-decorating ability wasn't limited to dipping madeleines in chocolate.