Green is the colour of nature, and is associated with growth, freshness, fertility, and wealth, but also jealousy, and in some cultures, illness. Pink is associated with femininity and therefore nurturing and soothing qualities, but sometimes its so over the top in its sweetness that its sickly sweet. While these colours are on opposite ends of the spectrum, they are actually pretty much the same. Perhaps it is because they are opposites that they get along so well.