Put something like the following in your ~/.gtkrc-2.0 file:
Note: to prevent this file from being overridden when changing themes use ~/.gtkrc.mine
instead
style "rox" = "default" { bg[NORMAL] = "#ffffff" bg[ACTIVE] = "#ffffff" } widget_class "*Collection*" style "rox"
Other widget_class backgrounds you may like to change include:
but remember that this will affect all GTK applications.
This is similar to the previous question. Put something like the following in your ~/.gtkrc-2.0 file:
Note: to prevent this file from being overridden when changing themes use ~/.gtkrc.mine
instead
pixmap_path "/home/yourhome/images" style "rox" = "default" { bg_pixmap[NORMAL] = "roxbg.png" } widget_class "*Collection*" style "rox"
See the GTK Theming Tutorial for more information.