This will keep them busy for a good while on a long too hot or rainy summer afternoon. All you need are the crayons, black tempera paint, a few drops of dish liquid (why – I’m not sure) and toothpicks or other object for ‘scratching’. Cardstock is helpful as the toothpicks won’t penetrate as easily as on regular paper.
Have your birthday child (and siblings) make up the underlying color palettes painted black and this can double as a party craft. Just provide construction paper frames (as in the picture) for them to take home their creations.