1. ArrayList myCircles;
2. int circleRadius = 10;
3. float ballSpeed = 2;
4. boolean ballHit;
5. int jiggle = 4;
6. 
   
7. void setup() {
8.   size(800, 600);
9.   smooth();
10.   textAlign(CENTER);
11.   myCircles = new ArrayList();
12.   myCircles.add(new Circle(random(width), random(height)));
13. }
14. 
    
15. void draw() {
16.   //background(255);
17.   fill(255, 10);
18.   rect(0, 0, width, height);
19. 
    
20.   if (frameCount > 60*ballSpeed) {
21.     myCircles.add(new Circle(random(width), random(height)));
22.     if (ballSpeed > 0.5)
23.       ballSpeed -= 0.05;
24.     frameCount = 0;
25.   }
26. 
    
27.   for (int i=0; i < myCircles.size(); i++) {
28.     Circle myCircle = (Circle) myCircles.get(i);
29.     myCircle.drawCircle();
30.   }
31. }
32. 
    
33. void mousePressed() {
34.   for (int i=0;i < myCircles.size();i++) {
35.     Circle myCircle = (Circle) myCircles.get(i);
36.     if (mouseX > myCircle.circleX-circleRadius && mouseX < myCircle.circleX+circleRadius &&
37.       mouseY > myCircle.circleY-circleRadius && mouseY < myCircle.circleY+circleRadius) {
38.       myCircles.remove(i);
39.     }
40.   }
41. }
42. 
    
43. class Circle {
44.   float circleX;
45.   float circleY;
46.   int circleSize = circleRadius*2;
47.   int alph = 0;
48.   float r = random(255);
49.   float g = random(255);
50.   float b = random(255);
51. 
    
52.   Circle(float tempX, float tempY) {
53.     circleX = tempX;
54.     circleY = tempY;
55.   }
56. 
    
57.   void drawCircle() {
58.     fill(r, g, b, alph);
59.     noStroke();
60. 
    
61.     circleX += (mouseX - circleX) * 0.05;
62.     circleY += (mouseY - circleY) * 0.05;
63. 
    
64.     /*if (mouseX > circleX)
65.      circleX += random(-jiggle, jiggle+2);
66.      if (mouseX < circleX)
67.      circleX += random(-jiggle-2, jiggle);
68.      if (mouseY > circleY)
69.      circleY += random(-jiggle, jiggle+2);
70.      if (mouseY < circleY)
71.      circleY += random(-jiggle-2, jiggle);
72.      */
73. 
    
74.     rect(circleX, circleY, circleSize, circleSize);
75.     alph += 10;
76.   }
77. }

Thanks for the response.

1. ArrayList myCircles;
2. float ballSpeed = 2;
3. 
   
4. void setup() {
5.   size(800, 600);
6.   background(255);
7.   smooth();
8.   myCircles = new ArrayList();
9.   myCircles.add(new Circle(random(width), random(height)));
10. }
11. 
    
12. void draw() {
13.   fill(255, 10);
14.   rect(0, 0, width, height);
15. 
    
16.   if (frameCount > 60*ballSpeed) {
17.     myCircles.add(new Circle(random(width), random(height)));
18.     if (ballSpeed > 0.5)
19.       ballSpeed -= 0.05;
20.     frameCount = 0;
21.   }
22. 
    
23.   for (int i=0; i < myCircles.size(); i++) {
24.     Circle myCircle = (Circle)myCircles.get(i);
25.     myCircle.drawCircle();
26.   }
27. }
28. 
    
29. class Circle {
30.   PVector circle = new PVector(0, 0, 0);
31.   int circleSize = 20;
32.   int alph = 0;
33.   float r = random(255);
34.   float g = random(255);
35.   float b = random(255);
36. 
    
37.   Circle(float tempX, float tempY) {
38.     circle.set(tempX, tempY, 0);
39.   }
40. 
    
41.   void drawCircle() {
42.     fill(r, g, b, alph);
43.     noStroke();
44. 
    
45.     PVector mouse = new PVector(mouseX, mouseY, 0);
46.     mouse.sub(circle);
47.     mouse.mult(0.05);
48.     circle.add(mouse);
49.     circle.normalize();
50.     circle.mult(10);
51. 
    
52.     ellipse(circle.x, circle.y, circleSize, circleSize);
53.     alph += 8;
54.   }
55. }

1. ArrayList myCircles;
2. float ballSpeed = 2;
3. 
   
4. void setup() {
5.   size(800, 600);
6.   background(255);
7.   smooth();
8.   myCircles = new ArrayList();
9.   myCircles.add(new Circle(random(width), random(height)));
10. }
11. 
    
12. void draw() {
13.   fill(255, 10);
14.   rect(0, 0, width, height);
15. 
    
16.   if (frameCount > 60*ballSpeed) {
17.     myCircles.add(new Circle(random(width), random(height)));
18.     if (ballSpeed > 0.5)
19.       ballSpeed -= 0.05;
20.     frameCount = 0;
21.   }
22. 
    
23.   for (int i=0; i < myCircles.size(); i++) {
24.     Circle myCircle = (Circle)myCircles.get(i);
25.     myCircle.drawCircle();
26.   }
27. }
28. 
    
29. class Circle {
30.   PVector circle = new PVector(0, 0, 0);
31.   PVector sum = new PVector(0, 0, 0);
32.   int circleSize = 20;
33.   int alph = 0;
34.   float r = random(255);
35.   float g = random(255);
36.   float b = random(255);
37. 
    
38.   Circle(float tempX, float tempY) {
39.     circle.set(tempX, tempY, 0);
40.   }
41. 
    
42.   void drawCircle() {
43.     fill(r, g, b, alph);
44.     noStroke();
45. 
    
46.     PVector mouse = new PVector(mouseX, mouseY, 0);
47.     mouse.sub(circle);
48.     mouse.mult(0.05);
49.     sum.add(mouse);
50.     sum.normalize();
51.     sum.mult(5);
52.     circle.add(sum);
53. 
    
54.     ellipse(circle.x, circle.y, circleSize, circleSize);
55.     alph += 8;
56.   }
57. }