Try different varieties of chocolate (including white) for unique flavors.
Line baking sheet with parchment paper.
In a double boiler or a pan over a slightly larger pan filled with simmering water, melt chocolate and oil.
Spoon dollops of melted chocolate onto parchment paper and top with blueberries.
Drizzle chocolate over blueberries and sprinkle with sea salt.
Freeze until set, around 10 minutes. Break apart if needed.