With a wide range of surfaces available to adhere to, why not utilize the marketing or informative potential of them? Wall Graphics, Window Clings, Floor Vinyls, Bumper Stickers, are all great for conveying information on what would have otherwise been an un-utilized surface. These come with either a strong or "weak" adhesive back-coating that can adhere to most flat, smooth surfaces to either stay indefinitely or be repositioned, respectively. Who needs empty space anyway?