On your
desktop, a 1024x768 (or so)
BMP (or
JPEG, or
TIFF) of
Ricky Martin, itty bitty
puppies (
oooh!), or Los Barbudos arriving triumphantly into
Havana. Or a small
tile made in the
GIMP, replicated to fill. The "wallpaper" of your
monitor.
For an anchor or host on television, it might be wallpaper also, but is most often that thing in the corner of the screen (over his/her shoulder) that tells you what the story's about. As if just listening wouldn't do the trick.