Take an empty coke bottle and fit it into a balloon. For adding a bit pop to this idea you could also decorate your balloon with beads, studs or design them with markers and glitters- after fitting the coke bottle.
Cute idea for backdrop at a childrens party. Or switch the colors for a high school or college graduation party, baby or wedding shower. Secure balloons together with ribbon and make sure you create a circular effect with them.