lubuntu icon theme change problems

view story

http://askubuntu.com – i have installed icon theme in lubuntu, icons have changed but not every. folder icons are the same but there are many many more icons for music folder, film folder etc, opera has new icon, but they didn't change. what have i do to have changed all icons from the new icon theme thanks, my file manager is defaukt from lubuntu, PcManFM (HowTos)