After seeing the new gtk theme for Lucid, I feel that the new theme has some more room for improvement. Here is the new Ubuntu 10.04 theme re-imagined. Of course this is not official. This is just my take on the new theme.
Personally I prefer the left - right for adjusting volume level but it's not set in stone. I think it's possible to achieve the same design using a vertical format.
using a vertical format.