I have jazzed up my Slinx theme and GTK3'd it.
The GTK3 code I used is based on Malys Universal - http://gnome-look.org/content/show.php/malys+-+universal+.....+newly+redesigned?content=147670
You will need murrine and pixmap engines for the GTK2 part of the theme.
I have included emerald (shot 1) and metacity (shot 2) themes in the download.
Please let me know if you have any problems with it and if you spot any strange bright red elements.
Also, please let me know what parts of the theme you do not like.