Here's a iTunes Unified installer.
It takes the burnt Unified and brings it back to the normal Mail colour.
iTunes Unified, direct link to dmg file
Still the ugly corners although I admit if every Apple app had the same corners and the same unified look I'd be jumping for joy just at the consistency of it all.
Rob at the Robservatory has updated his list of OS X interface looks. Now we have 7. Sigh.