So also a mocktail involving muddled mint and muddled frozen blueberries, a small amount of simple syrup and small amount of ginger syrup, and seltzer is pretty darn good! You do have to be careful with the ginger syrup or it will overpower the mint. (Really the mint just adds a taste of "fresh" more than "mint".
Anyway, I did this last night and it was yum.