Step 1. Open up a browser window and go to:
Step 2. You will be pointed to download a little Utility called “Rainbow Folders”.
Download the zip file and install it by running setup.exe
Step 3. Confirm installation and shell integration. Wait a few seconds for the installation to complete.
Step 4. Open a new Explorer window, and navigate to the folder you want to color. Right-click on it and select “Rainbow Colors”.
Step 5: Apply the window style and color of your choice. Hit “Colorize”.
Result: You have successfully changed your folder color.