SMART Exchange is a great resource for finding SMARTboard compatible lessons with interactive elements without reinventing the wheel. You can narrow your search by subject and/or grade level to customize your results.
Here are results for Halloween lessons by different grade levels. See what meets your needs and explore for lessons in different areas of your curriculum as well.
Halloween Websites for Kids
PBS Kids Halloween
Pick a Pumpkin on Starfall
Scholastic Stacks Halloween