Why no natural foods that are blue?

Well..... there are blueberrys which an actual fact are purple! But does mold count?

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Apparently you are not familiar with the blue corn of the American Southwest. Cornmeal and corn flour made from blue corn is entirely natural and produces Excellent - and very blue - corn chips, corn bread, etc.

"Red Onions and "Red Cabbage" are both natural foods and often turn blue when cooked, as I learned when I included red cabbage in a biscuit-topped casserole.

Regarding mold, I would consider the blue cheeses to be blue foods, and they can be "natural" depending on how the cheese is (or is not) processed. . . . starrskitchen.com

DUCK EGG BLUE IS NATURAL X AND BLUE BERRIES ARE BLUE NOT PURPLE!

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The following are indigo (purplish-blue) fruits:

Sloe, blueberry, damson, bullace, & huckleberry. The 3 you've probably never heard of are all in the plum family.