Starbucks Question, Tazo Pion Iced Tea/ Pion Iced Tea Lemonade?

Question about the Tazo Pion Iced Tea/ Pion Iced Tea Lemonade: I just started drinking them, it was good, but sort of plain. I was wondering, how can I spice it up? Like Shots of Raspberry, Melon,etc. Also is it better sweetened or unsweetened? Thxx!