Elementary Theme for Gnome Shell designed by Half-Left. Elementary Gnome Shell theme based on Elementary look inspired by Elementary GTK2 theme.
Elementary Theme is compatible with Gnome Shell 3. Also supports gnome-tweak-tool and extensions.
Then extract the file and copy it to Gnome Shell Theme path
Then restart Gnome Shell by clicking Alt+F2 then type r.
Check the download Link for more information about the background and icons.
Also here’s another Gnome shell theme designed by Half-Left posted earlier Here.
Thanks to Half-left.