Is there an app to be able to customize the appearance of basic interface elements in Big Sur?

[Tozovac]

I'm liking Big Sur so far but it's too darn white/stark for me. I'm one who appreciates seeing basic differences in shading/color for things like sidebar menus, top menus, etc. for a given app. Selecting "Increase Contrast" and "Reduce Transparency" in the Accessibility area helps but is not enough. Does anyone know of a good, stable 3rd party app for further fine-tuning basic appearance elements of Big Sur across the system and all apps? I was unsuccessful in finding one.

Thank you!

 

[Tozovac]

No options available?

 

[Airsculpture]

TinkerTool

 

[Tozovac]

TinkerTool

Thank you. I looked into this but didn't see any options for increasing contrast in the areas I find to be too monochromatic/white, such as in various controls/menu/folder areas, and things like increasing the contrast between individual lines of items, like messages in mail or daily financial entries in Quicken for Mac. Too, too white all over, not differentiated enough all over. Too minimalist white/clean interface, at the cost of a clear representation (fashion over function).

 

[newadventure]

https://www.macenhance.com/ might have some