I made a picture of a girl wearing a big hat on a misty day. I made it using the mr doob harmony app, on the sketchy tool. The sketchy tool is an algorithmic brush, which is code which elaborates on lines you draw. I looked at the source code. Here it is: stroke: function( mouseX, mouseY ) { var i, dx, dy, d; this.points.push( [ mouseX, mouseY ] ); this.