With a little efforts, we can turn our default Elementary OS Loki desktop into a better one. And one of my favorite theme for my Loki is Arc-Flatabulous theme. This combination between Arc GTK theme and Flatabulous window control makes my Elementary OS Loki looks better. Or at least, now I can stay longer working with my Loki without boring.
Install Arc-Flatabulous Theme on Elementary OS Loki
sudo apt-get install autoconf automake libgtk-3-dev git
Now download the package and start install it
git clone https://github.com/andreisergiu98/arc-flatabulous-theme && cd arc-flatabulous-theme ./autogen.sh --prefix=/usr sudo make install
Now you can activate the new Arc-Flatabulous theme using Elementary Tweaks.
Install Arc Icon Theme on Elementary OS Loki
Before installing Arc Icon Theme, it is recommended to install Moka Icon Theme first, because Arc Icon does not shipped with application icons. So it will use Moka Icon Theme for the application icons.
On Terminal, execute this commands to install Moka Icon Theme on Loki
do add-apt-repository ppa:moka/daily sudo apt-get update sudo apt-get install moka-icon-theme
Now install Arc Icon Theme
git clone https://github.com/horst3180/arc-icon-theme --depth 1 && cd arc-icon-theme ./autogen.sh --prefix=/usr sudo make install