Pepper is a gray, blue and black theme with glossy highlights.
The Pepper theme is a balance between shades of grey and black resulting in a theme which is easy on the eyes in any lighting condition.
One method to install a Gnome theme is to open the "Appearance Preferences" dialogue under System>Preferences menu and click the <Install> button. Gnome will prompt you to select a theme which in this case is Pepper-0.1.tar.gz. Once installed, select the Pepper theme from the list of available themes.
The Mist icon theme fits into the Pepper theme very well.