Yesterday I read this interesting article on the LXDE blog. For those who don't know yet, RazorQT and LXDE are joining forces, to make a extremely fast, beautiful and brand new desktop. And here we are, Lubuntu, with a promising RazorQT session available.
Until this arrives (the complete and finished RazorQT environment) you can install it via the official PPA and use this ready-made theme to match your Lubuntu Raring Ringtail desktop. Download it while it's hot!