sladen, GNOME Shell doesn't like the shadow and padding lines in metacity-1/metacity-theme-1.xml . If all of those lines are removed, the themes work just fine in GNOME Shell.
Window manager warning: Failed to load theme "Ambiance": Line 497 character 43: Element <padding> is not allowed below <frame_style>
sladen, GNOME Shell doesn't like the shadow and padding lines in metacity- 1/metacity- theme-1. xml . If all of those lines are removed, the themes work just fine in GNOME Shell.
Window manager warning: Failed to load theme "Ambiance": Line 497 character 43: Element <padding> is not allowed below <frame_style>