I wish I knew this tip for filling balloons with treats! 44 for Halloween sucked! to fill balloons. Instead of pinatas for parties. Great idea so that each child can pop one balloon and get the goodies inside.
How to keep a child busy for hours in the summer: DIY: Giant Ice Cube Awesomeness - filled with plastic animals, dinos, and such. And I'm sure you could put in food dye before its frozen to color it like the ice block in the photo.