Concord (or black) grapes; boysenberries; blueberries.
The closest I can think of, to an indigo colored food, is Blue cheeze--a greenish blue.
Indigo children or indigo colour?
Images of indigo
The colour indigo a rich dark purple/blue colour. An example of the colour indigo has been added to the related links section below for further reference.
a colour
(colour primaries, colour mixing, colour gamuts
There is no name for indigo colour in Hindi. It is called as indigo itself.
a colour silly
Indigo
indigo
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Indigo is often associated with depth, intuition, and mystery. It can evoke emotions of calmness, introspection, and spiritual awareness.
blue