Install Plus1 and Futura Themes on Ubuntu 13.04 Raring/12.10 Quantal/12.04 Precise/Linux Mint 15/14/13

Both themes are well designed by nale12. Futura theme contains two versions blue and red, literally it's look like windows 8 theme. futura theme offers version for GTK3/2, Metacity, Unity, Xfwm4, and Openbox.
Author mentioned Plus1 theme is inspired by Google Plus and he gives credit to Google. This theme offer versions for GTK3/2, Gnome Shell (3.6.x), Cinnamon, Metacity, Unity, Xfwm4, and Openbox.

1st: zonColor Wallpapers used in screenshots, Also checkout Black Wallpapers
2nd: Nitrux icons used in screenshots, Also checkout icons collection
3rd: You can use Unity Tweak Tool, Gnome-tweak-tool or Ubuntu-Tweak to change themes.

1) Futura Theme (GTK 3/2)

To install Futura theme on Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

• sudo add-apt-repository ppa:noobslab/themes
• sudo apt-get update
• sudo apt-get install futura

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Source: Plus1, Futura