Deep blue, like a ripe one, not the muffin.
Blueberry is a rich blue, close to navy.
It can be described as rich, full, medium and fairly saturated.
Set in white, because white reads best on it.
Blueberries are a widely distributed and widespread group of perennial flowering plants with blue or purple berries. They are classified in the section Cyanococcus within the genus Vaccinium. Commercial blueberries—both wild (lowbush) and cultivated (highbush)—are all native to North America. The highbush varieties were introduced into Europe during the 1930s.
Read on WikipediaBlueberry is a Western comic series created in the Franco-Belgian bandes dessinées (BD) tradition by the Belgian scriptwriter Jean-Michel Charlier and French comics artist Jean "Mœbius" Giraud. It chronicles the adventures of Mike Steve Donovan alias Blueberry on his travels through the American Old West. Blueberry is an atypical western hero; he is not a wandering lawman who brings evil-doers to justice, nor a handsome cowboy, who "rides into town, saves the ranch, becomes the new sheriff and marries the schoolmarm". In any situation, he sees what he thinks needs doing, and he does it.
Read on WikipediaProper noun