With my first set of paints and canvas, I decided to tackle each "raw" colour with an offsetting image in the middle. The image usually represented an obvious contrast in colour, but was directly linked to the primary colour of the background.
Red - Defiance: of the last green leaf of the season.
Yellow - Difference: a violet flower growing in a field of gold ones
Green - Solitude: of the young farmhand in a dark and windy field of grass
Blue - Drowning: seemingly impossible watery death of a rubber duck
18 x 24 inches (x4)