Microwave blueberries in a microwave safe bowl for 30 seconds to 1 minute or until the blueberries can be easily mashed. Mash blueberries with the back of a spoon, then strain the juice into 2 serving glasses. Add blueberry chunks, if desired.
Add crushed ice on top of blueberries in serving glasses.
Add half and half, vodka, and lavender simple syrup to a shaker with ice. Shake for 5-10 seconds, then strain into serving glasses. Garnish with fresh or dried lavender before serving, if desired.