ieOS7 icon set is same like iOS7 icons, it is designed by WendellBarroso for ElementaryOS. I received a message by Rutul to share this icon set with Linux community. There is also PPA for this icon set maintained by Carlos Gomes but only support for 12.04 precise, so I added these icons to our icons PPA for all current Ubuntu distributions. There can be some missing icon but there no way to report any missing icon or bug. CobiBird theme used in screenshots, also check themes collection.
You can use Unity Tweak ToolGnome-tweak-tool or Ubuntu-Tweak to change icons.
ios7 icons

ios7 icons

ios7 icons

To install ieOS7 icons in Ubuntu 15.04/14.10/14.04/12.04/Linux Mint 17.1/17/13 open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

To install ieOS7 icons in Debian/Any Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
Source: cjgomes-it
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