I think it is the ombre shading of the actual flowers- it's a more complex combination than you might think at first glance. However, I thought these pieces were close enough in terms of color. If they aren't inspiration enough for you, I suggest you head to your local eye doctor and ask them to test you for color blindness.
Vintage Harper Dress, Anthropologie, $325
Kay, Bakers, $59.99
RD Style Silk Basic Tank, Piperlime, $58.99
Colorful Paintstrokes Skirt, Forever 21, $16.90
Whether you incorporate this bright blue color into your outfit with a dress, a skirt, a top, or even a small accessory, I promise you won't regret the cheerful addition.