ftp sources for images?

[border at ux1.cso.uiuc.edu]

This probably is a "frequently asked question" but I am new here and
don't know who else to ask:  I am looking for libraries of iris image
files that are available by ftp.  If anyone has a 'directory' of what
is available out there with a brief primer on how to access the files,
I sure would appreciate a copy.  I am not looking for anything in 
particular, just want to play around with the image tools (tired of
Max Headroom) and create some fancy window icons.  Besides, our site
doesn't carry alt.sex.pictures :-) :-)     

Ryan Border.