AreaFillPatterns

ps.map's

http://grass.ibiblio.org/grass61/manuals/html61_user/ps.map.html#vareas

pat - full path to pattern file. Pattern file contains header and simple PS commands. It is similar to EPS but more limited, that means that each pattern file is EPS file but EPS files are not usually usefull as pattern files because contain restricted commands. Color and width of patterns is set by acolor and pwidth until it is overwritten in pattern file. Currently the only way to create pattern file is text editor. Example of pattern file:

%!PS-Adobe-2.0 EPSF-1.2
%%BoundingBox: 0 0 10 10
newpath
5 0 moveto
5 10 lineto
stroke

[insert demonstrative image here]

Alternative: QGIS will let you load a GRASS map (with the GDAL GRASS-plugin installed) and change the area fill pattern on-screen.