I've always loved blue and green colours together, these two colours are a perfect match in my opinion (this is also one of the reasons why I've always loved the semi precious stone Chrysocolla-Malachite - but that's a story for another day).
Here these two colours meet in this shot of the grape hyacinth flowers in our garden. Grape hyacinth is an early spring-blooming bulbous perennial that is native to southeastern Europe (and Denmark), in Danish we call them "perlehyacinter", and their Latin name is Muscari.