Seems that flamerobin works on windows8 , i have spotted it on Marcu Cantu's blog
Yes he does use a classic skin , seems that underneath win8 = win7 with yet another ugly skin (designed for tablets only)
If you are stuck on Windows7/8 there is a nice alternative shell if you want to be productive : multi tasking ...
(http://classicshell.sourceforge.net), which has the
benefit of being free with source available.