A lot of work has been done on this. For instance, see also http://tex.stackexchange.com/questions/39296/simulating-hand-drawn-lines http://tex.stackexchange.c

A lot of work has been done on this. For instance, see also http://tex.stackexchange.com/questions/39296/simulating-hand-drawn-lines http://tex.stackexchange.com/questions/39296/simulating-hand... and http://tex.stackexchange.com/questions/74878/create-xkcd-style-diagram-in-tex http://tex.stackexchange.com/questions/74878/create-xkcd-sty....