WE Ergo Blue GTK/Xfce port. Original theme for Windows XP is to be found at [link] My thanks to Gelosea for allowing me to port the theme.
Archive contains GTK2 theme (using pixmap engine) and theme for bmpanel2 (not compatible with version 1). Xfce panel is themed too, but due to its limitations it doesn't look as nice as bmpanel2.
Archive also contains patch for pixmap engine to enable mouse-over for menubar items and making disabled images grayed (instead of that ugly "dot effect") and some enhancements for GtkStatusbar (no more blured resize grip on windows resizing, shadow is drawn all over the statusbar).
Then there is patch for Thunar file manager to get the location bar as in the screenshot (url entry is shown when the icon is clicked on).
Applying the patches is not a must, but recommended. If you don't patch thunar, comment marked line in xfce.rc (line 12).
Forgot to mention: xfwm4 theme included
Edit 2009-08-27: Created theme for metacity. It's a bit hacky and you shouldn't set too big font (I use 8pt bold @96dpi)