Many school principals have discovered the power and potential of using school-wide themes to build school spirit, morale, camaraderie, and test scores. At Lewis Vincent Elementary School in Denham Springs, Louisiana, this year's theme is teamwork and the slogan is "We're On the Same Team." "Themes are a great way to coordinate all activities throughout the year," Vincent Elementary's principal, Carol Robertson, told Education World. "Our teachers and I choose a theme before we leave for the summer. That way,…