SUMMER THEME Puffy Ice cream- glue and shaving cream. Also, leave paint white and paint on black ghost shapes for Halloween. Remove eye and mouth holes with q-tip or black paper ovals will stick to glue/shave cream mixture
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.