Click on it to see animation. A bunch of zigzags stacked together to create a living creature.

This particle shape was sort of made by accident. I initially wanted it to pulse outwards like this.

However I was playing with the array loop variables and notices that if I made their number of iteration increase through the array loop, they stack up and create a living looking creature. I decided I really like it and also wanted to show the structure. Therefore I made the top one as well so you can see each individual part, and then can imagine how the bottom one was made much easily.

ArrayList<Tentacle> tentacles = new ArrayList<Tentacle>();
ArrayList<Zigzag> zigzags = new ArrayList<Zigzag>();

ArrayList<Tentacle> tentacles2 = new ArrayList<Tentacle>();
ArrayList<Zigzag> zigzags2 = new ArrayList<Zigzag>();

int numberOfTentacles = 20;
int numberOfTentacles2 = 8;

int frame = 0;

boolean a=false;

boolean b=false;
void setup()
{
 for (int i = 0; i < numberOfTentacles; i++) {
 Zigzag zigzag = new Zigzag
 (
 new Vec2(260, 250), // position
 2 * i, // segments
 new Vec2(10 +0.1 *i , 80 + 0.1 *i) // size
 );
 
 zigzags.add(zigzag);
 }
 
 for (int i = 0; i < numberOfTentacles; i++){
 Tentacle tentacle = new Tentacle(100, 100, zigzags.get(i).points);
 tentacles.add(tentacle);
 }
 
 for (int i = 0; i < numberOfTentacles2; i++) {
 Zigzag zigzag = new Zigzag
 (
 new Vec2(260, 150 -(i*20)), // position
 4 * i, // segments
 new Vec2(10 , 80 ) // size
 );
 
 zigzags2.add(zigzag);
 }
 
 for (int i = 0; i < numberOfTentacles2; i++){
 Tentacle tentacle = new Tentacle(100, 100, zigzags2.get(i).points);
 tentacles2.add(tentacle);
 }
 
 size(500, 500);
 frameRate(60);
}

void draw(){
 
 background(20,30,40);
 for (int i = 0; i < numberOfTentacles; i++){
 tentacles.get(i).update();
 }
 
 for (int i = 0; i < numberOfTentacles2; i++){
 tentacles2.get(i).update();
 }
 
 
 if(a){
 if(b){
 saveFrame("picture"+frame+".png");
 frame++;
 }
 b=!b;
 }
 a = !a;
 
 if(frame > 60){
 noLoop();
 }
}

// rotateJoint based on http://stackoverflow.com/questions/2259476/rotating-a-point-about-another-point-2d

class Joint{ 
 Vec2 p1;
 Vec2 p2;
 Vec2 distance;
 
 float woo;
 
 float easeValue;
 boolean easeDirection;
 
 int numberOfJoints;
 Joint nextJoint;
 
 Joint (Vec2 p1, Vec2 p2, boolean easeDirection)
 {
 // create the center point
 this.p1 = new Vec2(p1.x,p1.y);
 
 // create the perimeter point, pointed up
 this.p2 = new Vec2(p2.x, p2.y);
 
 distance = new Vec2
 (
 abs(p1.x-p2.x),
 abs(p1.y-p2.y)
 );
 
 this.easeValue = 0;
 this.easeDirection = easeDirection;
 
 woo = 2*PI/120;
 }
 
 void rotateJoint(float angle){ 
 if(easeValue > 2*PI){
 easeValue=0;
 }
 
 if(!easeDirection){
 angle *= -1;
 }
 easeValue += woo;
 
 float easeAngle = easeValue * angle;

 //easeAngle = angle;
 float s = sin(easeAngle);
 float c = cos(easeAngle);
 
 p2.x -= p1.x;
 p2.y -= p1.y;
 
 // rotate point
 float xnew = distance.x * c - distance.y * s;
 float ynew = distance.x * s + distance.y * c;
 
 // translate point back:
 p2.x = xnew + p1.x;
 p2.y = ynew + p1.y;
 }
} 

class Tentacle { 
 float x;
 float y;
 ArrayList<Joint> joints = new ArrayList<Joint>();

 Tentacle (float x, float y, ArrayList<Vec2> points){ 
 this.x = x;
 this.y = y;
 
 boolean isLeft = false;
 
 for (int i = 0; i < points.size()-1; i++){ 
 Joint joint = new Joint
 (
 new Vec2(points.get(i+1).x, points.get(i+1).y),
 new Vec2(points.get(i).x , points.get(i).y),
 isLeft
 );
 
 isLeft = !isLeft;
 joints.add(joint);
 }
 }
 
 void update(){ 

 
 for(int i = 0; i < joints.size()-1; i++){
 Joint joint = joints.get(i+1);
 Joint jointNext = joints.get(i);
noFill();
 
 jointNext.p1.x = joint.p2.x;
 jointNext.p1.y = joint.p2.y;

 strokeWeight(1);
 stroke(255,255,255,60);
 line
 (
 joint.p1.x,
 joint.p1.y,
 joint.p2.x,
 joint.p2.y
 );
 
 strokeWeight(i/2);
 stroke(joint.p1.x, joint.p1.x*i, 30, 20);
 float ellipseSize = i/1 * 1.1;
 ellipse(joint.p1.x, joint.p1.y, ellipseSize, ellipseSize);
 joint.rotateJoint(1); 
 
 
 //ellipse(joint.p2.x, joint.p2.y, 10,10);
 }
 } 
} 

class Vec2{ 
 float x;
 float y;
 
 Vec2 (float x, float y)
 {
 this.x = x;
 this.y = y;
 }
} 

class Zigzag{ 
 ArrayList<Vec2> points = new ArrayList<Vec2>();
 
 Zigzag(Vec2 position, int numberOfSegments, Vec2 segmentSize){ 
 // Create a uniform zigzag
 for (int i = 0; i < numberOfSegments; i++){ 
 Vec2 vec2 = new Vec2(position.x, position.y + segmentSize.y * PennerEaseOutSine((float)i/numberOfSegments));
 
 // Change zigzag direction
 
 points.add(vec2);
 }
 
 // Create the zigzag
 for (int i = 0; i < points.size(); i++){
 points.get(i).x += segmentSize.x * PennerEaseInSine((float)i/numberOfSegments);
 segmentSize.x*=-1;
 }
 }
 
 void render(){
 noFill();
 beginShape();
 
 for (int i = 0; i < points.size(); i++){
 strokeWeight(i/4);
 stroke(i*25,i*35,0);
 float ellipseSize = i/1 * 1.1;
 ellipse(points.get(i).x, points.get(i).y, ellipseSize, ellipseSize);
 
 stroke(90,90,0);
 strokeWeight(0.4);
 vertex(points.get(i).x, points.get(i).y );
 }
 
 endShape();
 }
}