Change client front end (graphics supplied) CSS

Okay I have 2 chats, one old, nice graphics... one new, far better back end... BUT the new one is ugly and I want the old one when launched in client browser to look like the old one... So I need a CSS guru who can take the template graphics etc from folder, and integrate into the new (ugly) version Needs to look identical for end user... Will involve skipping around various folders and files, if it was easy I would do it! CSS expert only! Will be a quick job if you know what you are doing...