This would be so simple and elegant for a winter wedding tablescape / centerpieces.Create a simple centerpiece with holly in little vases. Fill with water and then add a tealight. (One of 8 diy candle projects)
Fill the balloon with water . This image illustrates why you don't completely fill the balloon you should always leave some room in the neck of the balloon, then as the form dries the pressure has somewhere to go and your clay wont split.