Eelementaryish theme is GTK theme, It is specially designed to use with Gnome Classic and Unity. It looks like Mac theme. This theme comes with two versions - with dark panels and menus (elementary-dkpanel), and with light panels and menus (elementaryish). Elementaryish theme works with Unity and with Gnome Classic Session (gnome-fallback). This theme is based on Greybird theme and inspired by Elementary theme. This theme was designed to use with AppMenu (Global menu), of course you can use it with standard menubar, but it looks best with Appmenu.
Nitrux Icons used in screenshots or Check icons collection
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You can use Unity Tweak Tool, Gnome-tweak-tool or Ubuntu-Tweak to change themes.
To install Elementaryish theme on Ubuntu/Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal: