The movie wasn't anything special, not scary either. The only thing that came from this movie is a cool Scandonavian folklore about Huldra and a cool costume idea.
Not only would it be pretty, but creepy as well. There are a bunch of different pictures so it would be easy to make up your own costume the only important thing is the tail.
I wouldn't watch the movie again, but I would definetly like to see more of these creatures since they are similar to mermaids and wood nymphs.