You must be running Android 14 or newer which uses the Material You style. There, you have the option to customize the color of your apps based on your wallpaper. You can also use ColorBlendr to select any color you like, independent of your wallpaper colors. It needs either root or Shizuku. If you are rooted you can have a more granular control over the UI elements being themed. If you only use Shizuku, you are more limited. However Shizuku is easier to use.

If you search launcher on f-droid there's quite a few.

Is that what you mean? Or something else?

Here's the f-Droid link: https://f-droid.org/packages/app.murinelauncher

Settings.. app drawer... Select frosted