Paint them and impale them on bamboo sticks and use in the garden as supports or fence or screen. Cover them in fabric and use a christmas decorations. Make a game by painting some pots with numbers and trying to throw the balls into them to see who can get the highest score or give the pots a letter and throw the balls to see who can make the longest word. etc............Thread the painted balls on to ropes using a knot to secure them from dropping (If being spaced out) and form a curtain or screen trellis...........
well to play tennis? Play ball with your dog or cat;Use in dryer kinda smelly woolzies work better; Can use in sock for back,hips,legs & shoulder physical therapy/myofascial release https://www.painscience.com/articles/tennis-ball.php ; https://blog.paleohacks.com/tennis-ball-to-release-tight-hips/ ; https://blog.paleohacks.com/tennis-ball-tight-legs/ some more https://www.sierrasil.com/connect/news/general-health/tennis-ball-myofascial-release/ EVEN MORE USES https://www.sierrasil.com/connect/news/general-health/tennis-ball-myofascial-release/ MORE https://www.rd.com/home/cleaning-organizing/tennis-ball-hacks/ Ok found MORE https://www.youtube.com/watch?v=hn9fWS-KYsg MORE https://www.youtube.com/watch?v=Cgj-gtEj8fU OK I'm done