Change theme variation a bit.

themes/variation/bottom-active.xpm

themes/variation/bottom-inactive.xpm

themes/variation/bottom-left-active.xpm

themes/variation/bottom-left-inactive.xpm

themes/variation/bottom-right-active.xpm

themes/variation/bottom-right-inactive.xpm

themes/variation/close-active.xpm

themes/variation/close-inactive.xpm

themes/variation/close-pressed.xpm

themes/variation/hide-active.xpm

themes/variation/hide-inactive.xpm

themes/variation/hide-pressed.xpm

themes/variation/left-active.xpm

themes/variation/left-inactive.xpm

themes/variation/maximize-active.xpm

themes/variation/maximize-inactive.xpm

themes/variation/maximize-pressed.xpm

themes/variation/menu-active.xpm

themes/variation/menu-inactive.xpm

themes/variation/menu-pressed.xpm