where themes images in ubuntu?

[saidbakr]

Hi,
From System->Preferences->Appearance->Theme->Customize->Controls I use a control called Clearlooks. I'd like to change its progress bar color. I think that there is an image in somewhere that hold the progress bar design. I need to know where is this Image?

[Frogs Hair]

The clearlooks theme is located in file system > usr/share/themes , but it has an rc file not an image .