Choose warm (reds, oranges, yellows, pinks) or cool colors (blues, green, violets) for your background.
Lightly color with chalk pastels. You do not need a ton of color to get a fun look. Work with an extra paper under projects to help with the mess.
Use your finger to blend the colors in the background.
Use the opposite colors inside the heart. Lightly add the warm or cool colors inside the heart. Overlapping colors will create a fun new color when you blend.
Blend heart colors with finger, blending stump or paper towel.
Use a white pastel to add a crescent shape on one side of the heart. You also add it to the edge of the top.
Add shadows with black chalk pastels and blend with your finger.
Spray your drawings with hair spray or workable fixative.