Hi, welcome to LQ.
Why didn't you install Knoppix in the first place? Anyways, you could look at Debian if you prefer a mature distro, and Knoppix is Debian-based after all.
As for the desktop look, I don't know which desktop environment FC4 comes with by default, but if it's Gnome you can replace it with KDE, which is used by Knoopix.
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