You can edit over 500 .png files to look however you like. Any stylye or color or picture for that matter that you like. Task bars/ header bar/widgets/window boarders/message boarder/volume control/ if you see it it can be changed, for the most part.

ThemMaker0.5 is an interesting concept it has a sourcetheme.png thats one huge image of all the indevidual (500+ seperate images) on one image, simply edit what you see on that one file. Each element is an exact size on the picture and must stay inside those bounds (the red lines). Save the file and run the thememaker.