do you mean the OSX look?
if so go into the KDE Control Center under Desktop -> Panels you can center it and shrink it under "Arrangement" than under the "appearance" tab click on enable tandsparency and if you want it even more like OSX click on Icon zooming, and than under the advanced menu click on hide for the applet handles. Than just remove the applets you dont want ie clock, system tray etc. that should get it looking like the one in that picture, minus of course the Icon set.
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