He means instead of having the white background in folders, is there a way of having an image as a background. I know it was possible in Windows 98 but I don't think you can in XP. Maybe Microsoft forgot about it or wanted their OS to look clean and tidy.
EDIT: Found this, although you have to buy it, it gives you a free trial:
There's loads you can do, change folder background, log-on screens, Internet Explorer skins