I found this on the internet, http://www.babble.com/home/blowing-up-2 ... n-madness/

Ha! We always use up the spare paper plates with the paddle ball idea shown in the link at my own kids parties after everyone has left! Good fun! the glowstick in a balloon idea I have seen loads though on pinterest and totally doesn't work in my experience - anyone had any luck with it?

I just watched this, and the Vase idea looks so much like your one balloon flower in a vase xx