For the first part of this exercise I needed to take the following colours:
Red: green 1:1
Orange: blue 1:2
Yellow: violet 1:3
These are my attempts at this.
Red: green - 1:1
Orange:blue - 1:2
Not such an easy colour relationship to find in nature, so I have improvised!
Yellow: violet - 1:3
Fortunately I had some pansies in my garden with flowers of these colours. Here I have cropped the photo to achieve the correct ratio.
For the second part of this exercise I have chosen some images with colour combinations that appeal to me...]
This image appealed to me because of the three primary colours: green, yellow and red. The pattern of the maize adds to the effect created by the strong colours.