You can add a new option for the window frame setting in the Theme preference tool. Window frame options reside in the /usr/share/themes/option-name/metacity-1 directory. The typical structure of a window frame option in the file system is as follows:
Gaia hobespen-tresnako leiho-markoen ezarpenen aukera berri bat gehi daiteke. Leiho-markoen aukerak /usr/share/themes/aukera-izena/metacity-1 direktorioan daude. Fitxategi-sistemako leiho-markoen aukeren ohiko egitura honelakoa da: