Moka Theme and icons - Excellent design in Linux MInt
Themes
Moka Theme is modern dual-colour theme for GTK3-based Linux desktop environment. It encorporates a quasi-flat style, using simple geometry & basic colouring.
Installation into Linux Mint:
Moka for mate
sudo add-apt-repository ppa:moka/stable
sudo apt-get update
sudo apt-get install moka-gtk-theme moka-icon-theme
Moka for cinnamon
sudo add-apt-repository ppa:moka/stable
sudo apt-get update
sudo apt-get install moka-cinnamon-theme moka-icon-theme
Moka for Plank
sudo add-apt-repository ppa:moka/stable
sudo apt-get update
sudo apt-get install plank-theme-moka
Good Luck!!!
http://mokaproject.com/
Faba icon set from Moka design
Oranchelo - flat-design icons on the desktop of Linux Mint
Material Design Adapta - flat beautiful theme
Paper - icon, gtk and cursor themes on Linux Mint
Arc Theme - very beautiful flat design theme
Emerald-icon-theme - Clean and fresh icons
Icons Humanity Colors - includes 3 new colors with 12 colors variations in linux Mint/PinguyOS
AwOken & kAwOken Icon Sets in Linux Mint