X and Fluxbox :: Adding new window managers

Ok, dunno about KDE, but here's the process of install for GNOME.

First off, you need a harddrive install with a sane build environment and apt (see the DamnSmallManual 4 DamnSmallLinux)

Press ctrl-alt-backspace.

Next: (optional)
update your x-server to the latest version

apt-get install xserver-xfree86

Next, install gnome:

apt-get install gnome

Finally, adjust your .xinitrc. Comment out the while file and add the line, "gnome-session"

type "startx", and you're in your shiny new GNOME environment. Have fun, and don't tease the penguin.

original here.