Beat an egg white with a fork just enough to break it up, but not enough to make it frothy. Using a pastry brush paint the egg shell all over to seal the surface. The egg white will dry very quickly since the eggs are still warm. It is advisable to give each egg two coats. When dried the eggs will look just the same, except that they have a slightly shiny surface. Coloured felt-tipped pens, water colours or poster colours will go on quite smoothly and can be used to make quite elaborate designs. Little hats made from scraps of material, or wool for hair can be added to those with faces.