Of the three, fvwm looks most like a 'normal' window manager. It's pretty basic, though. When you start it up for the first tine, there's no desktop decoration at all. No menu bar, no docking bay; the only thing you can do is to click on the desktop, which fires up a basic menu.
However, one of the options on the menu allows you to create your own configuration file. The form (which isn't wildly user-friendly) allows you to set up modules which will provide some desktop furniture (a pager and icon manager, for example). Graphically, though, the modules are pretty horrible – I'd rather just stick with no desktop furniture at all and just use the menu.
You can edit the ~/.fvwm/.fvwm2rc file to make changes to the look-and-feel. More usefully, you can also use this file to set up your own root (and other) menus, which means you can customise the desktop-click menu to fit your own usage. Manual config editing like this is great if you want maximum control over your desktop experience.
Read the rest at Linux Planet.