BlueAlthough it's calming and peaceful, blue was once considered an unattainable garden color since it's rarely found in nature (consider the pursuit of the rare blue Himalayan poppy or the rose industryās obsession with breeding a blue hybrid tea).The compelling presence of blue can appear in your garden with help from a can of periwinkle paint, a turquoise-tile pool or aqua cushions. Blue cools us down. If you donāt have a swimming pool to bring the serene presence of blue into the landscape, paint the inside of a birdbath, display a grouping of glazed blue pottery, or lay a path with blue tiles.