Replacing The Blue Folder Icon With A Customised Image?

How can I select a JPEG image and use that to customise/replace the usual blue folder icon for a given folder (which additionally may even make it easier to tell folders apart, when looking for one)?

If this can be achieved without the use of a specific App, then all the better.

Solution 1:

1. Open the image that you would like to be the folder icon in Preview.

2. Press ⌘ cmd + A to select the entire image and press ⌘ cmd + C to copy it.

   

3. Get Info (⌘ cmd + I) on the folder.

4. Click the folder icon on the top-left and press ⌘ cmd + V to paste in the icon.

   

To revert back to the default blue folder…

1. Get Info on the folder.

2. Click your icon in the top-left.

3. Press ⌘ cmd + X.

The folder icon is stored in the folder, as a hidden file.

.
└── Icon?
0 directories, 1 file

You can also remove the folder icon using the following Terminal command inside the folder with the icon that you wish to remove:

rm Icon$'\r'