Use a pencil and a ruler to draw a 2-inch border around the canvas so the painting will be centered. The pencil lines along the edges will guide your first brushstrokes.
Pour red paint onto a plate; this will be your starting color. Mix the red and white paints together in the remaining plates so you have six more shades, from dark to light.
Starting with the darkest paint, make a single brushstroke from top to bottom on each side of the canvas. Follow your pencil line for guidance.
Wash the brush, pat it dry, then repeat with plates 2 through 7. The single center stripe will be the lightest color.