Using a teaspoon scoop some of the melted chocolate from the bowl and flick your teaspoon forward and back over the Easter Egg, with the tip of the teaspoon pointing downwards. You may want to practice on some greaseproof paper before applying to your egg.
Repeat the process with the other chocolate colours until you have created a pattern that you are happy with. Leave the egg to dry. You could prop it upright on a ramekin to prevent it from rolling away.