How to remove white frame for thumbnails in Nautilus 3.x ?

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http://ubuntuforums.org – Does anyone know, how to remove the white frame around thumbnails in Nautilus 3.x. Changing the frame in Nautilus 2.x is shown here: http://ubuntuforums.org/showthread.php?p=12011808 , but with Nautilus 3 there is no file named "thumbnail_frame.png". Greetings LJ (Hardware)