cardboard tubes + box = hours of fun! We pieced together TP and paper towel tubes. Used marbles. The kiddo loved it and even still pulls it out to roll the marbles into a dump truck. He wont' let me toss any cardboard tubes now.
Make one special photo charms for you, compatible with your Pandora bracelets. "Knock the Balls!" DIY Kids Nerf Target Game Tutorial via Frugal Fun 4 Boys - Knock the Balls Down Nerf Target Game - Super boredom buster, and a fun party idea too!