Method 1
You will need Seashore to do this.
1. Open Seashore and check transparent background on the following window:
2. Enter 512 by 512 and click create.
3. Then when the app opens press "shift + ⌘ + S" and save into the desktop as a TIFF image.
4. Quit Seashore and open the image on the desktop.
5. Open image and press "⌘ + A" then copy it.
7. Tap the folder and press Press " ⌘ + I"
8. On the below window click the icon and paste.
Method 2
1. Open Terminal and type the following command "chflags hidden"
2. Before running it, get the path of the folder for example, /Users/username/Desktop/filename
3. So the command should look something like this "chflags hidden /Users/username/Desktop/filename"
4. To unhide the folder just change hidden to nohidden