This was a theme that I was working on around when I was creating JGD-Black, as this theme is a variation of it. The upcoming theme is called Gold Bars. Even though the first screenshot depicts the theme mockup, an Inkscape drawing, it is well under development and will be posted to GitHub sometime next month.
The bottom screenshot shows the checkbox and radio button icons in GTK3 Widget Factory.
Gold Bars GTK theme mockup in Inkscape
Gold Bars checkboxes/radio buttons
The plans, once completed will be to add a couple of wallpapers to go with it. Right now, a bit more of detail work still needs to be done. I will keep you, my readers, posted.