Is part of the marble dark theme. I tweaked the color by using the script they provide to change the accent color to something more in line with the wallpaper. You can also use other colors! Give it a try and let me know if it works

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I’m also using Blur my Shell and other minor tweaks

It’s called Marble. It’s in the gt3-gt4 section in the gnome themes website. Later I will add a link to the wallpaper and the theme.

Sure. I’m just starting my day. If you can wait a few hours I’ll add a link

Yeah! That’s what I wanted to do. Unfortunately the theme only has that red. And I don’t really know how to manually choose a color and modify the file