Run make W=width H=height
Output look a little something like
$$$@@B%8&W#*
$$$$$$$@B%8&W#oakd
B@@$$$$$$@B%8&M*ohbpwZ
&8%BB@@@@@@B%8&W#ohbpwZ0LJ
MW&8%%%BBB%%8&M#ohbpwZ0LJY
o*#MMW&&&&&&WM#*akbpwOQCUXcu
khaoo**###**oohkbpwZ0LJYcvnr
pddbbkkkhhkkbdpqmO0LJYzvnrf/
ZZmmwwwqqwwmmZOQLJUXcuxjf/|)
LLQQQQQQQLLCJUYzcunrft\(){
XYYYYYYXXzzcvunxjf/\(){}[?
uuunnnxxrjft/\|)1{}]?-
ftt//\||()1{}[?-_+
11{}[[]?-_+~