This is an evolution (fork) from the already wonderful E17GTK theme by TSUJAN (https://www.pling.com/p/1013662/ and https://github.com/tsujan/E17gtk).
This theme fits very well with the default theme for the Enlightenment desktop. It also matches Kvantum's default theme. It's dark gray with blue accents, and non-flat (quite skeuomorphic). It's very easy on the eyes and also very usable. It includes a GTK2 theme too.
It has some minor tweaks, here and there.
I've also added an xfwm4 theme (which is usable in many other contexts, since it adapts to gtk colors!)
I have this theme as a git so if you clone it, you can always pull the latest updates without having to download it again. For example, you can go to your ~/.themes folder and execute there
git clone https://git.disroot.org/eudaimon/E17gtk-revolved.git
Then you just need to go to ~/.themes/E17gtk-revolved and execute "git pull" each time you'd like to check for updates (not very often, I should say).
You may also create a symbolic link in /usr/share/themes, so applications run as root (such as synaptic) can also appear correctly:
sudo ln -s ~/.themes/E17gtk-revolved /usr/share/themes/E17gtk-revolved
By the way: for some reason, in this preview, window buttons appear on the left, and there is also no close button. Maybe it is because I'm currently using lxqt and it has messed with window buttons configuration? Buttons should appear normally, in general.