As well as perennial delphiniums and Campanula persicifolia, try annuals such as larkspur, cornflower, nigella, California bluebell (Phacelia campanularia), nemophila and kingfisher daisies (

Source: https://www.odt.co.nz/lifestyle/home-garden/your-garden-november-3rd

Curious, I stepped into my local Michaels and was greeted by walls of accessories in lilac, bubblegum, and cornflower blue.

Source: https://www.popsugar.com/home/michaels-sweet-and-spooky-halloween-decor-49257323

French people frequently wear a bleuet (cornflower) on their lapel as a symbol of remembrance for those who died, similar to the Poppy worn by the British and other allies of the conflict.

Source: https://www.france24.com/en/europe/20230508-france-s-macron-commemorates-the-end-of-wwii-in-europe