Fluxbox: No folder icons in Thunar and PCManFM

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http://askubuntu.com – I have an Ubuntu 12.10 installation and wanted to try out Fluxbox as a lightweight window manager. When I open Thunar it displays no icons for folders. I googled and made sure I have a .gtkrc-2.0 in my home directory. Do you have any ideas what to try out? Kind regards - Markus (HowTos)