I am SO GLAD I found this!!
I copied the files in the images folder and achieved some success in replacing the gold frames with silver. However, some of the windows still have gold frames. Those i've noticed are chat, compass, quest helper, bags, group window, tradeskill window and windows settings.
I have noticed that some of these actually have changed on their working surfaces, ie - the buttons within the group window, but their frames are still gold.
Any suggestions how to fix this?