http://www.freeiconsweb.com/index.html
http://www.crystalxp.net/galerie/de.cat.1.html
http://www.famfamfam.com/lab/icons/silk/
http://www.kde-look.org/index.php?xcontentmode=22x27
http://art.gnome.org/themes/icon/
http://www.pinvoke.com/icon/image/fugue_all.png