Here we see two thunar file manager windows on Zenwalk where the active window shows the content of a Zenwalk CD.
Been playing with AIGLX powered compositing on Xfce a bit and made an quick OS X like looking desktop.
A detached accessories menu on React OS desktop.
A React OS start menu. Notice the little tick buttons in the top right corners of menus. They serve for detaching the menu turning it into a window.