Take advantage of plastic plugs of the bottles, to make some precious seals.
Cut out with the help of scissors, figures in eva gum, the ones you like the most.
With the help of glue, glue a figure on a plastic bottle cap. Let it dry.
Fill in a container, paint of the color you want. Impregnate the stamp on the face where the foam is, and stamp that figure on paper.
Ask your child to do this with various caps and shapes, and on plastic containers. Various colors, so you can make the drawing you want.
More information - Stamps with erasers
Source - Martha Stewart