In most (American) hotels that I've been to, I couldn't accidentally lose something under the bed, because the space between the floor and the frame is protected by boards or panels.
I'd like to get a set of those for home. Does anyone know what they're called? Can they be bought alone, or do they only come as part of the bed frame?
EDIT: In response to the first two answers: the ones I saw are not decorative; in fact, they're recessed to the point that you might never see them unless you bend down.