Blue strawberries DO exist ... But they are still in the research phase.
http://buzz.naturalnews.com/000061-food-science-GMO.html
Scientists are genetically modifying strawberries in order to allow
them to resist freezing temperatures better. They're doing it by
artificial transfer of genes from a species of fish called the Arctic
Flounder Fish. The Arctic Flounder Fish produces an anti-freeze that
allows it to protect himself in freezing waters.
They isolated the gene that produces this anti-freeze and introduced it to the strawberry. The result is a strawberry that looks blue and
doesn't turn to mush or degrade after being placed in the freezer. While they're not in production, research is ongoing.
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Blue raspberries also exist ... "Rubus Leucodermis" aka "whitebark raspberry"
