FVWM-Crystal is an eye-candy, functional and ultra-fast desktop environment for GNU/Linux, based on FVWM. Crystal can be used even on very old machines, thus it is a noticeable alternative to popular desktop choices like XFCE or Fluxbox.
So yes, this only applies to a small amount of of viewers. But this is a great looking window manager for Linux. After reading through this article, I gave it a try and was impressed. It’s still not my cup of tea compared to KDE, but it’s a good competitor to the other minimal DE’s out there.