Pairs of colors, like blue and orange, green and red or purple and yellow are called complementary colors. They look extra bright and busy beside each other.
Let is turn these busy colors into a bright and lively city street.
Mix up gray paint, using a little black and a little white paint together. Cover the background to make a gray sky. Let this dry.
Using a spoon, drop blobs of paint on the background, putting complementary colors next to each other.
Press a square of cardboard on one blob of paint at a time, dragging it down to the bottom of the canvas.Keep doing this until you have a painting full of colorful city buildings. Don't the colors together make the buildings jump out at you? Let this dry.