Begin with a solid-color T-shirt (we like classic white). Prepare a work surface by laying down newspapers, and place a piece of cardboard inside the T-shirt to prevent paints from soaking through.
Next, dilute colorful fabric paints with water. Place paint on the T-shirt and use drinking straws to blow it in all directions, creating colorful explosions. Afterward, let the shirt dry and follow the paint's instructions for setting, which can include ironing or tumble-drying.