In a small saucepan over high heat, bring ingredients for the simple syrup to a boil. Stir until the sugar is dissolved.
Once dissolved, remove from heat and cover. Let steep for 30 minutes.
Strain into an airtight container and chill until ready to use.
To make the cocktail, add simple syrup, vodka, and lemon juice to a highball glass filled with ice. Stir to combine.
Top with club soda. Garnish with blueberries, thyme and a lemon wheel.
Serve immediately.