These are the Mojave GTK and icon themes for snaps. Mojave like themes which supports GTK 3 and GTK 2 based desktop environments like Gnome, Unity, Budgie, Pantheon, Cinamon, XFCE, Mate, etc. This snap provides the GTK themes in a form that can be used by other snapped applications.
This snap is packaged from vinceliuice's repositories. You can download the whole theme from there: