I haven’t seen much discussion about borders. And it’s not clear to me if this is covered in the spec. Something that allows you to apply an image to each border and control its positioning and tiling, ie…
border-left: 2px solid #000 url(image1.jpg) repeat-x 0 0;
border-right: 2px solid #000 url(image2.jpg) repeat-y 100% 100%;
border-top: 10px solid #fff url (image3.jpg) no-repeat 0 0;
border-bottom: 1px solid #000;