I believe some schools encourage creativity and help to improve it.
When I was younger, in elementary we didn't do a lot of actual learning. Instead, we spent most of the class time working on creative projects that really had nothing to do with learning at all.
When I got older, in high school, I realized that art wasn't as appreciated as it was when I was younger. But, I don't know if I would say the curriculum "killed" my creativity. A lot of people in my school were into art, but they all had the same idea that "art wasn't a career".