Metal X Gnome Shell theme by justviper gives your shell clean and polished metallic look. White and grey combination works really well here and feels very similar to elementary theme.
Download Metal X Gnome Shell Theme
- Backup /usr/share/gnome-shell/theme folder
- Extract the archive and rename gnome-shell to theme
- Copy this folder to /usr/share/gnome-shell/
- Restart Gnome Shell by hitting Alt+F2, then type r and press enter