For some reason the Dust Metacity border was altered to make it look, in my view, worse a couple of Ubuntu editions ago. This theme is an edit of mine using that border with a version of my other other gtk theme, New Wave Reprise, utilising a panel background to fit Dust Reprise.
It would be not so clever to do endless edits of existing themes and this is the only other one I'm intending to do, not to offend the creative types that make themes from scratch! But again I think I've tidied up and preserved a theme with a subtler colour scheme that hopefully others will enjoy.
The panel background has to be added by the user and is stored in the theme's folder once installed - drag the panel.png or top panel.png file to your panel.