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Sometimes brand guidelines can be hard on the eyeball, and you don't have the clout to rewrite them.
A quick demo of some Deco borders thrown together with a couple of pseudo-elements
Trying to do it in a single element
Where a button element doesn't belong (outside of a form, for example), an anchor can be used with the same visual styles. Indistinguishable to the user from a button, but semantic markup.
A demo navbar built with CSS3, no images. Falls back to flat colours for older browsers.