Imagine a group of Hogwarts schoolchildren, many years after the events of DH (your choice if that's "after the final chapter" or "after the epilogue"), with their enchanted jumprope that doesn't require anyone to hold the ends. Of course, they won't be saying Muggle jump-rope rhymes; they'll have their own. Muggle kids chant about Lizzie Borden and London Bridges. Wizard kids make up rhymes about their own heroes.