Is there a way to make
gnome-shell themes work with Unity? Thanks!
I must say that it doesn't, the Gnome-shell themes are not entirely compatible.
The themes that are supported by Unity are GTK+ & GTK2 & GTK3.
There are other themes that you can install more easily (from the terminal).
And don't forget that you can make your own theme for Unity!
GNOME 3 themes? Install