At Easter time, one group of teacher candidates taught a lesson in which we made balloon eggs out of balloons, yarn, and a glue mixture. First, I blew up my balloon to a size that was just a little larger than a softball. Then, on a foam plate, I made a glue mixture by mixing equal parts Elmer's glue and water. I had about 20 pieces of yarn that were approximately 20 inches long each. I soaked each piece of yarn in the glue mixture and then wrapped them around the circumference of the balloon in different directions. The pieces overlapped in many places. After all yarn pieces were attached to the balloon, I set it on a plastic cup and let it dry. Once it was dry, the balloon was popped and the yarn egg held its shape. My egg is in the back left in the photo below.
Because this project helped students learn about the math concept of circumference, an extension activity for this project would be to learn about volume in math. Students could blow up balloons to different sizes or use other objects and submerge them in water to find out how much volume each of them has. There may need to be a clip or a string attached to the balloon to keep it under the surface of the water. 
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