To make these fun DIY Stress balls, I 1st made homemade playdough. To make the homemade playdough, I mixed flour, salt and water and kneaded it all together well. I then stuffed a balloon with the play dough and tied it closed, then pulled another balloon over that one and cut the top of the tying part off. Easy as that! Your own diy stress balls and you can draw faces on them with a permanent marker :) these would work great as kids birthday-party favors!