try this.. i got it from the php cookbook. and converted it to perl. 
    my $back_pixbuf =  Gtk2::Gdk::Pixbuf->new_from_file($image);
    my ($pixmap,$mask) = $back_pixbuf->render_pixmap_and_mask(255);
    my $style = $window->get_style();
    $style=$style->copy();
    $style->bg_pixmap("normal",$pixmap);
    $window->set_style($style);

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In reply to Re: Perl-Gtk2::How to set a window background image. by renegadex
in thread Perl-Gtk2::How to set a window background image. by turo

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