Two new icon sets just got uploaded to Gnome-look recently. Both are from the same artist.
The first one is OSX-Nostalgie, a combination of the style
of Mac OS X and the style of Ubuntu. Here are the screenshots of OSX-Nostalgie:
To download OSX-Nostalgie, click here.
The other new icon set is Ubuntu Style. The design has the same style as OSX-Nostalgie.