Please, tell me what theme you used for the screenshot on the homepage, and how you installed it. All my attempts to re-theme Kdenlive have been fairly grim.
The theme is called "Wonton Soup", it comes by default with KDE. If you are using a gnome Desktop, you will probably need to install the "systemsettings" app from KDE that allows you to change the color scheme for KDE applications
i have rencently installed ubuntu 12.04 (dual boot on mac book pro!), and i setup same kind of (system) theme playing with 'myunity' , so the kdenlive who run there look like your screenshot !
Nota:In this install, i have converted a friend (and a mac!)) who did professional video editing with apple's habitual stuff to this tiny (in terms of space in the disk, it's incredible!!!) wonderful toools of video creation:kdenlive on gnu/linux
No way to change this setting on an OS X system?