Pharago provides a nice Gnome (GTK+) theme.
Pharago is a mix of Gonxical for the style and Gnursid for the colours.
There is an alternative menubar for blended window manager themes :
Copy menubar-4blending.png to menubar.png to setup the new menubar
(copy menubar-default.png to menubar.png to get the default one back)
Clearlooks is an engine and it is easy to configure it to have different colour variations I suppose. Pharago is based on Gonxical just like Clarity is (pixmap themes) and it takes more time to change the colours because many pixmaps need to be redesigned !
· GTK+ 2.x
.Drag and drop this theme into the theme manager to install.