It seems that the creator of the Windows Vista Transformation pack has put out a new version, Windows 7 Transformation Pack. It is made to make your Windows Vista or Windows XP/2003 computer to look like windows 7. Unfortunately however it does not support 64 bit Operating Systems, so I have no way of testing it. If it works as well as the Windows Vista one did however I would at least give it a try.
Download link: http://www.softroof.com/7tp/