My friend visited me recently, and we made a bubble factory for her daughter. She loved it! Now that G & GA are getting older these things have lost their interest.
To make it cut two holes in the top of a yogurt cup:
Sorry this isn't a good picture, anyhow cut a small hole on the top and a larger hole on the bottom. Fill the yogurt cup half full of bubble mix. Insert a straw in the small hole and let the child blow bubbles. If you are worried about the child sucking up the bubble mixture, cut a hole in the straw about one inch down. This will keep her from sucking up the bubbles.