I use jwm (joe's window manager) on two freeBSD computers. Can't do the obligatory screen shot cause it's a blank screen with just a mouse cursor. No wallpaper or icons, nothing. Originally, it did have a tray, but I x'ed that out, didn't need it. It had ability to show multiple screens, but I x'ed that too as I run dual monitors. Just click the mouse and a menu pops up to start whatever programs I've put into it. It's pure simplicity and fast.