WoWInterface - Background Black Boxes

i dont know exactly where they come from, if its a mod or even if it is already built in to the game, but i would like some of those little black boxes for a background and/or to border all my spells and chat boxes and such.

MazzleUI has pretty much what im looking for but thats a huge compilation, and i dont really plan on downloading all that for something so small
http://www.wowinterface.com/download...fo.php?id=6311

notice the borders and background to the tooltips, kind of what im looking for but not necessarily so intricate. if its a mod i would really appreciate some help pointing me in the right direction, or even if its built in and i havent noticed it.

Thanks