LubuntuBox is elegant and well designed icons by Lubuntu team, They did hard work on every pixel of icons and finally made these nice icons.
"A lot of office and coding support was added, as well as new and improved app icons. And it grows and grows. All Lubuntu users will get their update. This was an extremely hard work. Every icon is being retouched pixel by pixel so you can get a nice interface and you'll be comfortable with your desktop. I'd like to dedicate this theme to my "mentor" and inspiration icon guy, Jakub "Jimmac" Steiner, and of course, Danrabbit  the creator of Elementary, both obligatory references in the interface design scene. Oh, and to all the Lubuntu crew, specially the one who usually saves my life designing with me, Alexander Andjelkovich, another member of the Lubuntu Artwork Team."
lubuntu icons
lubuntubox icons

You can use Unity Tweak ToolGnome-tweak-tool or Ubuntu-Tweak to change icons.

To install Lubuntubox icons in Ubuntu 12.04/Linux Mint 13 open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
Source: box-theme
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