I think I have found the answer:

    user_renderer = Gtk::CellRendererPixbuf.new
    col = Gtk::TreeViewColumn.new
    col.title = "pic"
    col.pack_start(user_renderer, false)

    pixbuf = Gdk::Pixbuf.new('/home/demas/settings/awn_icons/emacs.png')
    user_renderer.set_pixbuf(pixbuf)
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