Boy, those things are bad. They're strange medleys of clip art, stock images, bona fide news photos and poorly done Photoshop effects, and it's troubling that CNN relies on them so heavily.
I suspect most of these images were produced on tight deadlines in order to add visual interest to the site's pages. But when images are so badly done they're embarassing, it's time to reconsider whether they're necessary. TV news' there-must-be-an-image-on-the-screen-at-all-times mentality doesn't translate to the Web.