Draw a snake on black paper and cut it out. Cut this snake in pieces, making straight or curved lines. Lay each cut piece directly on your background, in order not to lose a piece.
Glue all the pieces one by one on the background with a millimeter space between them.
Pour tempera paint on saucers and dip the head of a nail in the paint. Stamp dots, following the snake, in the colours you like. Use different sized nails if you like.