It's the cornflower on the cake! The beautiful natural blue colour of cornflowers persists even when dried, making it a nice decorative finish for naked products.
Cornflower, also known as bluebottle, is a tall, slender, annual plant with long and fine, grey-green leaves. In the summer it grows bright blue flowers, but occasionally they can be white, pink, or purple. It is often found in cornfields and waste grounds in Europe and western Asia.
The flower is part of the genus Centaurea (also known as knapweed) which name comes from the legendary centaur Chiron, famed for his knowledge of herbs.