There are a number of discussion threads on the google groups ggplot2 page: 
here are two of them.
http://groups.google.com/group/ggplot2/browse_thread/thread/ca546f7f4d636deb/e0763a54b7735c35?lnk=gst&q=fill+pattern#e0763a54b7735c35

http://groups.google.com/group/ggplot2/browse_thread/thread/9a9c081d235efc24/d319d4500174cdd7?lnk=gst&q=fill+pattern#d319d4500174cdd7
Scott
On Wednesday, May 18, 2011 at 8:39 AM, Christopher Desjardins wrote:
Hi,
> I am wondering if there is a way to change the pattern of the fill in
> histogram in ggplot2? By default the fill is solid and I'd like to add some
> sort of pattern to make it more visible that these are different levels of a
> factor.
> 
> Thanks!
> Chris
> 
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