I'm having some trouble with an icon I tried changing in Snow Leopard. I've changed a couple of the folder icons on my portable hard drive and on the desktop with no problem. However once I have changed them from the blue folder icon I can't change them again. Am I limited to changing from the blue folder to an icon and that's the end of it? One of the folders I tried to switch didn't work properly and now instead of a blue folder or an icon I am left with a icns stock image.