Do you like MacOS X icon theme? Now you can make your Linux looks like MacOS X. You can download the OSX Icon Theme for Gnome Linux. This icon theme contains many icons that designed for Gnome. There are many icons for specific applications such as empathy, DeVeDe, Nautilus, Cheese, FShot and many others.
It looks nice huh?
Download the icon set from this link. You will need gnome-tweak-tool package to apply this icon to Ubuntu or other distribution.