First Technique: Dissolve a Crayola watercolour of your choice in 2 ounces of hot water (Adult assistance required). Pour the dissolved watercolour into an ice cube tray. Experiment with different colours until the tray is full. Break craft sticks in half and place on in each slot of the ice cube tray. Place in freezer for 5-6 hours. Once frozen the colourful ice cubes can be used to create your own icy watercolour creation.