Twin directories of bitmaps:

[DIR]  ftp://ftp.nlm.nih.gov/visible/bitmaps/
[DIR]  ftp://ftp.bath.ac.uk/pub/eespjl/cantor/cantor/qj/bitmaps/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/support/xtexshell/bitmaps/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/fonts/utilities/ps2pk/ps2pk15/ps2pk/bitmaps/
[DIR]  ftp://ftp.x.org/pub/unsupported/programs/xbiff/bitmaps/
[DIR]  ftp://ftp.x.org/contrib/bitmaps/
[DIR]  ftp://ftp.kreonet.re.kr/tools/www/uiarchive-tools/webcopy/source/Mosaic-2.4.3/src/bitmaps/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/support/xtexshell/bitmaps/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/fonts/utilities/ps2pk/ps2pk15/ps2pk/bitmaps/
[DIR]  ftp://ftp.stsci.edu/cdbs/perigee/bitmaps/
[DIR]  ftp://131.155.2.27/pub/tex/ps2pk15/ps2pk/bitmaps/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-5_BETA/xsrc/xfree/xc/include/bitmaps/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-5_BETA/xsrc/xfree/xc/programs/xbiff/bitmaps/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/games/x11/xneko/bitmaps/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/games/x11/xroach/bitmaps/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-release-4-0/src/x11/include/bitmaps/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/xsrc/xfree/xc/include/bitmaps/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/xsrc/xfree/xc/programs/xbiff/bitmaps/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/x11/include/bitmaps/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/xsrc/external/mit/xbiff/dist/bitmaps/
[DIR]  ftp://ftp.mcs.vuw.ac.nz/_mnt/pub/packages/X/R5/mit/include/bitmaps/
[DIR]  ftp://ftp.wu-wien.ac.at/pub/src/X11R6.3/xc/include/bitmaps/
[DIR]  ftp://ftp.vims.edu/incoming/HA/PixeLINK4.0/src/PxLDevApp/bitmaps/
[DIR]  ftp://ftp.uni-koeln.de/tex/support/xtexshell/bitmaps/
[DIR]  ftp://ftp.uni-koeln.de/tex/fonts/utilities/ps2pk/ps2pk15/ps2pk/bitmaps/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/latex/dante/support/xtexshell/bitmaps/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/latex/dante/fonts/utilities/ps2pk/ps2pk15/ps2pk/bitmaps/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/games/x11/xneko/bitmaps/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/games/x11/xroach/bitmaps/
[DIR]  ftp://ftp.ics.muni.cz/pub/EMIS/journals/DMTCS/bitmaps/
[DIR]  ftp://ftp.ics.muni.cz/pub/EMIS/journals/DMTCS/dmtcs-ojs/index.php/dmtcs/article/bitmaps/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/mirror/X11/unsupported/programs/xbiff/bitmaps/
[DIR]  ftp://24.215.0.24/CTAN/support/xtexshell/bitmaps/
[DIR]  ftp://24.215.0.24/CTAN/fonts/utilities/ps2pk/ps2pk15/ps2pk/bitmaps/
[DIR]  ftp://ftp.sztaki.hu/pub/tex/support/xtexshell/bitmaps/
[DIR]  ftp://ftp.sztaki.hu/pub/tex/fonts/utilities/ps2pk/ps2pk15/ps2pk/bitmaps/
[DIR]  ftp://ftp.sztaki.hu/pub/X11/X11R6.6/xc/include/bitmaps/
[DIR]  ftp://ftp.tug.ctan.org/pub/tex-archive/support/xtexshell/bitmaps/
[DIR]  ftp://ftp.tug.ctan.org/pub/tex-archive/fonts/utilities/ps2pk/ps2pk15/ps2pk/bitmaps/
[DIR]  ftp://ftp.lip6.fr/pub/www/tools/webcopy/source/Mosaic-2.4.3/src/bitmaps/
[DIR]  ftp://ftp.lf.net/pub/X11/bitmaps/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-4-0/src/x11/include/bitmaps/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/x11/include/bitmaps/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-0/src/x11/include/bitmaps/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/xsrc/xfree/xc/include/bitmaps/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/xsrc/xfree/xc/programs/xbiff/bitmaps/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/xsrc/external/mit/xbiff/dist/bitmaps/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/src/x11/include/bitmaps/
[DIR]  ftp://ftp.sk.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/src/games/x11/xneko/bitmaps/
[DIR]  ftp://ftp.sk.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/src/games/x11/xroach/bitmaps/