this is what I use, it is post flash, but very effective and only takes a couple of minutes (though I wouldn't mind being able to change the icons too, just I think you have to change a .dll file and I don't know how to do that yet).
there is a readme that explains how it works in the cab that you can look at and here are some places to get icons:
http://www.iconarchive.com/category/folder-icons.html