For Samsung devices with One UI, the background colour of the folders can be changed. In addition to the predefined colours, such as the standard white, you can also select your own colour from the colour palette. You can also adjust the transparency of the colour.

Android 10 (One UI 2.0)
Step 1:  Tap on  folder  you want
Step 2:  Tap on  Color
Step 3:  Tap on the  colour palette
Step 4:  Choose  Color  you want
Step 5:  Confirm with  Done
  1. Tap on folder you want
  2. Tap on Color
  3. Tap on the colour palette
  4. Choose Color you want
  5. Confirm with Done

Samsung Instructions
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