When I first begin exposing students to plagiarism as a serious academic offense, it is always surprising how many students (and parents!) ask me why it’s such a big deal. That’s why each one of my early projects focuses on creating awareness of plagiarism as a really bad act.
With that in mind, I created stop plagiarism bracelets to handout to students. First, they like getting something for free. Second, now they have a reminder on their wrists that they should never commit plagiarism in any of their classes. The bracelets have worked for me as a plagiarism awareness tool. It might work for you too.