If you've been making your sketches in the Studio, you may have noticed a new camera icon in the top-right corner of your canvas. Clicking this little camera will take a snapshot of your sketch that can be used in a few different places. When a canvas is not running, your snapshot will act as a preview of what's to come. Clicking the button still brings it to life, but now you have a sense of what that may do.
A few caveats: The snapshot functionality is only accessible while a sketch created in the studio is in Edit Mode. Sketches that import images from elsewhere on the web cannot be snapped, but images uploaded to the sketchpad server itself will work just fine.