GTK-2/3 Theme adapted for Plasma Theme "Shamrock", which you can download: Here
The theme was tested on KDE Plasma 5.16.4, for GTK applications in Plasma.
Link to Wallpaper "KDE Plasma Abstract 337 HD": Here
Link to Wallpaper " KDE Plasma Abstract 327 HD":Here
Author Wallpapers: Charlie-Henson