Elementary Lion 1.1 is a Mac OS X theme for GTK. It only contains Window decoration theme which works perfectly on Elementary OS Luna, EOS Freya, Ubuntu 14.04, Xubuntu 14.04, 13.10, Linux Lite 2.0, PinguyOS 14.04 and many others.
When combined with ieos7 icon theme, Elementary OS looks better as above. To download Elementary Lion 1.1, please download it from the link below.
Next, extract the file you’ve just downloaded and move it to /usr/share/themes
tar -xzvf elementary\ Lion\ 1.1.tar.gz
sudo mv elementary\ Lion\ 1.1 /usr/share/themes
Now you can change your theme with this Elementary Lion 1.1 using Gnome Tweak Tool, Unity Tweak Tool or Elementary Tweaks (on Elementary OS)