Check out the Theme Editor.
01. Load your current theme into the editor.
02. Save a separate copy of your theme.
03. Scroll down to the segmented meters images.
04. Right click on the meter image, and choose import.
05. A series of folders will appear. Open the one labeled "meters".
06. Choose the meter with the name that corresponds to what you initially right-clicked on.
07. Hit OK.
08. Save your meter every time you pick a new one so you can test it in Sonar.
There are 39 sets of meters labeled by color, along with Tungsten and Mercury.