How to change "Ordinary Metacity" titlebar color?

Hello, I’m using OpenSUSE 13.1 and Cinnamon 2.0.14 (Gnome 3 is also installed, but I don’t use it). I’m not sure what window manager I’m using, I thought it was Metacity, but YaST shows that the package metacity isn’t installed. Well, I installed this theme:

I extracted and unpacked it to /usr/share/themes and it’s working just fine, but windows titlebar is always blue. How can I change it to another color? Gnome-look description shows a lot of color alternatives, but I can only get a blue titlebar. I checked the only configurable file in this theme (/usr/share/themes/Ordinary Colors/metacity-1/metacity-theme-1.xml) and it doesn’t mention colors, it mentions parameters like “gtk:bg[SELECTED]” and “gtk:fg[NORMAL]”. Maybe the titlebar color is defined automatically using some GTK theme color parameter, because when I select a file in Nemo or a text in a text editor, the selection is always blue, the same as the titlebar color. Could you guys please help me change the titlebar color of this theme to silver (#d8d8d8)?