Blackberry Borage Fool

A fool is a simple, old-fashioned English dessert made with fruit folded into whipped cream. It is so light you could fool yourself into thinking it has no calories at all, and the layers of flavors are complex enough that it is satisfying without being filling. British accent is optional.
Cooks' Note
To use borage flowers, first pluck the flower from the plant at the base of its stem. Then wash and dry the flowers and, using a thumb and forefinger, gently tug at one of the five blue petals. The blue flower should easily come apart from its hairy green star-shaped receptacle.