Processing with Function

//---------------------------------------
void setup(){
 size(1200, 700);
 smooth();
 background(241);
 noLoop();
}

void draw(){
 for( int i=0; i<9; i++){
  int s = int(random(7, 51));
  int w = 2*s;
  int n = int(random(9, 51));
  drawVine(  int(random(w, width-w)), n, s );
 }
}
//---------------------------------------


//---------------------------------------
void drawVine( int x, int numLeaves, int leafSize ){
 strokeWeight(1);
 stroke( 0, int(random(0, 71)), int(random(71, 180)));
 line( x, 0, x, height );
 strokeWeight( 1/leafSize );
 int gap = height /numLeaves;
 int direction = 1;
 for( int i=0; i<numLeaves; i++ ){
  int colorR = 0;
  int colorG = int(random(0, 71));
  int colorB = int(random(71, 180));
  noStroke();
  fill( colorR, colorG, colorB, random(99, 255) ); //random color for fill
  int r = int(random(gap));
  drawLeaf( x, gap*i +r, leafSize, direction );
  direction = -direction;
 }
}
//---------------------------------------


//---------------------------------------
void drawLeaf( int x, int y, int size, int dir ){
 pushMatrix();
 translate(x, y);   //move to position
 scale(size);   //scale to size
 beginShape();   //draw the shape
 vertex( dir, -0.6875 );
 bezierVertex( dir, -0.6875, dir*0.4375, -1.03125, 0, 0 );
 bezierVertex( 0, 0, dir, 0.375, dir, -0.6875 );
 endShape();
 popMatrix();
}
//---------------------------------------