(Yes, I know it's been over a year since anyone posted here, but I'm hoping the occasional thread necromancy might encourage a few people back...)
So I'm running Arch + xfce + Kwin + Cairo Dock across two monitors (a 24" full HD TV on the left [1980x1080], a 19" monitor to the right [1440x900]).
The preview below is 1117x359, clicking on it will take you to a near full sized version (3128x1005 compared to the 3360x1080 original).
The picture is a DIY photo of part of Kenilworth Castle - the central portion with the large windows was originally the Great Hall, with vaulted stores below.