Before I came to France I thought that if I simply squeezed a blob of yellow and a blob of blue paint onto a surface and mixed them together they would turn out to be a perfect replica of natures greens, however there are no "perfect" colors in nature. All colors are a combination of all the colors. For example the color green:
It is not complete until you add its complementary color red:
By combine a color with its complement, you are mixing together all the primary colors (Green=Blue and Yellow; Red). When you start to realize that all colors are present in every color, it opens up your mind to see so many naturally occurring complements. For example shadows are not merely gray and black they are shades of red and violet against the Yellow/green of the leaves. Complements are found every where in nature.
So make this your challenge. Look around at the colors you see in nature. Notice how the red brick buildings make the green trees pop out beside them. If you paint, try to experiment with adding the complement or as Van Gogh would say "breaking the colors." You will then realise that in every thing there is present a mélange of the colors or the grays of nature.