We need a building block for inserting a screenshot into the page. This should style the screenshot according to our style rules, scaling the image to fit the available space. Clicking the screenshot should present the full-size image (perhaps as a lightbox). Screenshots should be able to have an optional border around them (unless otherwise stated by the style guide), and should be able to be optionally captioned.
The Building Blocks project is dead for now. I'm closing this bug.