Remove the label from a clean, clear 16oz. plastic soda bottle. Pour at least 1/2 cup of light corn syrup into the bottle. Then add a few drops of food coloring and some glitter and/or confetti. Hot glue the lid onto the bottle. Have the children swirl and shake the bottle and watch it's movement. These can be varied considerably and still work great. Use the natural tendencies of oil and water to make a "lava lamp" type bottle. Just mix oil and water half and half, add a few sparkles and secure the lid. You can use 2 pop bottles joined at the mouth for these interesting bottles. Be sure to secure them very, very well, using hot glue gun or duct tape to prevent leaks.