Sometimes a "theme" isn't just about system colors. Combining a standard dark theme with Rainmeter widgets can create a 3D environment.
This allows you to apply a "3D Bevel" effect to windows. You can make your File Explorer look like it is carved out of glass or metal, complete with realistic drop shadows that go downward onto the desktop. 3d theme for windows 10
No is complete without changing the icons. The default flat icons will clash with your new 3D visual style. Here are the best icon packs to pair with your theme: Sometimes a "theme" isn't just about system colors