A very simple activity to do is to obtain seals for stamping shape and colors on paper, starting with erasers.
Take one eraser, and with the help of a cutter, cut out the shape of your choice. It is convenient to draw in pencil the shape you want beforehand.
The flower or cloud shape are the simplest and most popular to make. Once the eraser has the desired shape, pour some of the painting.
Put the stamp on it so that it impregnated, and then stamp it on paper.
This activity is ideal to do with children, and ask them to make some beautiful cards, for example, like the ones in the picture.
More information - Crafts for children: making stamps
Source - Martha Stewart