Desktop unveiled

[Diabolis]

The Great Desktop Effects FAQ of 2008

The window decorator sits on top of
the window manager which sits on top of
the desktop manager.

Desktop managers:
0.- Gnome
1.- KDE
2.- XFCE
3.- Enlightenment
4.- FVWM-Crystal
5.- LXDE
6.- IceWM
7.- Fluxbox
8.- Window Maker
9.- After Step

Window managers:
0.- Metacity
1.- Beryl
2.- Compiz
3.- Compiz fusion Compiz fusion is a separate project which builds upon Compiz, Beryl + Compiz extras
4.- FVWM

You swap between window managers with the --replace argument, examples: metacity --replace or compiz --replace

Window decorators:
0.- GTK window decorator
1.- KDE window decorator
2.- Emerald

Some possible combinations:

compiz
fluxbox
emerald / compiz / gnome
gtk decorator / compiz / gnome Ubuntu default since Gutsy Gibbon 7.10
gtk decorator / metacity / gnome Ubuntu default, if visual effects are turned off

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All this comes from gnome-look or kde-look, but this links contains a selection of what is considered by their authors the best, plus the screenshots are easier to view.

Log in screens:
30 Cool Linux Login Screens

Gnome themes:
Collection of 50 Best Looking Linux Gnome/Ubuntu Themes