BUTTONS! I love buttons, especially the cube shaped buttons that are lit from inside.
I like the Tungsten color theme, but the buttons in the 8.5.1 theme actually LOOK like real 3D buttons that light up when pressed, and dimly light when moused over, as opposed to the flat one-dimensional squares that are in the new Sonar versions. If I had the time and patience, I'd keep the color theme from Tungsten and just replace all the flat buttons to the more realistic looking cube buttons.
THIS is what buttons should look like: