How to change folder color and icon in windows 7/8/10

The default icon set in Windows is a little limited but you can get free icons off the internet. I used IconFinder. I downloaded this red folder as an experiment:
You need to download the ico file from that site. I recommend saving them in a directory somewhere away from the folders you are editing.

Right click the folder you want the customise and select properties and then click on the "Customise"
tab.

Click "Change icon" then you can browse through the window of the default icons or click "Browse" and navigate to your downloaded icons and select the one you want.

Then click OK and click "Apply" on the properties dialog box. Your folder will have now changed to the one you chose.

If you can't find any icons you like you can make your own in Paint and save them as a 64x64 gif then change the suffix to ico.

If you want to change back to the default icon you can go to the icon chooser dialog (second picture) and click "Resore Defaults". This will return the folder to the Windows default folder icon.