Pour some glue in a bowl. Add some water to make it thin. Take a long length of thread and dip it in the glue. Keep it aside for some time.
Blow the balloon till you get a small round shape. Tie the balloon.
Now take the end of the thread, and tie it tightly on the tip of the balloon. Wrap the thread all over the balloon.
Let it dry well. Once the thread dries well, simply pop the balloon using a pin or nail.
Remove the balloon parts through the gap of the threads.
Now you can make a hanging or mobile by tying the same colour of thread on the thread ball. Make more balls using different colour threads to decorate your Christmas tree.