it is possible to create custom hatch files.
these files have the extension .pat and are actually a scripted file.
here is some information with a few links to .pat file creators
http://autodesk-revit.blogspot.com.au/2011/09/creating-custom-fill-patterns-easy-way.html
unfortunately i don't think its as easy as it sounds without spending something like $125 (as it mentions in above link)
i you go into a materials graphics settings in the material browser you can slightly customise the surface pattern then create a new one and select "custom" instead of simple thats where you can import your .pat file.
i do believe that they can be created using autocad.
check out that link and see what the .pat files that come with revit look like in autocad and try reverse engineer it.
good luck 🙂