When fully zipped, this DIY sweatshirt project simply displays a bold, graphic right hand, perhaps a bit influenced by street art. But unzipped halfway, and you're offering a whole 'nother message. Instructable-r IPXav walks you through the whole process of creating one yourself, including sharing a free, downloadable template. He admits that a proper Vulcan salute should have the thumb extended, so adjust the image as necessary before printing it out and cutting your stencil.
Live long and prosper.