"default XGL install"? Remember, XGL is just a piece of software and as far as I know, has nothing to do with GTK themes. The themes depend on Gnome version and/or distribution, so..got it? That theme on the screenshot is probably the one the new Gnome uses by default (no matter if one has installed XGL or not), so you should ask "what is the default theme of Gnome 2.18" (if I remembered the version correctly)
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