https://www.deviantart.com/sehnsucht94/art/OPENLOOK-SunOS-li... http://www.martin-graefe.homepage.t-online.de/xview_en.html
I did not only like its look, but also many of its paradigms: That basically everything is started by clicking on the empty desktop, which opens up a menu (you see that menu on the far left in the image); that you can pin menus and other elements to keep them open (even that initial menu mentioned before, it's pinned in the screenshot), that some buttons were "drop down" buttons with multiple actions, and application menus were exactly that (look at the "menu bar" in the File Manager window)...
Meanwhile, CDE is ugly as sin and clunky: https://en.wikipedia.org/wiki/OPEN_LOOK#/media/File:CDE_2012...