/usr/share/themes
system themes directory
View metacity themes
metacity-theme-viewer [THEMENAME]
metacity-theme-viewer allows you to preview any installed Metacity theme.
When designing a new Metacity theme, you can use metacity-theme-viewer to measure the performance of a window frame option, and to preview the option.
Name of the theme to be shown (Atlanta by default). It is case-sensitive.
/usr/share/themes
system themes directory
/usr/share/themes/*/metacity-1/metacity-theme-1.xml
theme specification file
13 releases since Debian 3.0 (Woody); the text changed 2 times.