Storyboard That offers more than 40,000 customizable pieces of clipart that your students can use in cartoon storyboards. To find the Halloween-themed clipart just search for "Halloween" in the Storyboard That editor. When you find a piece of clipart that you like, drag it into a storyboard frame where you can adjust its size, shape, and positioning.
For an overview of how to use Storyboard That, check out this recording of a recent webinar that they sponsored here on FreeTech4Teachers.com.
Storyboard That is an advertiser on FreeTech4Teachers.com