Processing Experiment # 1 - (create your own)

void setup () {
  size (1000, 1000);

}
int i;
 void draw () {

     fill(#F7F7F7);
   ellipse(mouseY, mouseX, mouseY,mouseX);
    fill(#AAD9EA);
   ellipse(mouseX, mouseX, mouseX,mouseY);
    fill(#139B48);
   ellipse(mouseX, mouseY, mouseX,mouseX);
   fill(#5B139B);
   ellipse(mouseX, mouseY, mouseX,mouseX);
    fill(#AAD9EA);
   ellipse(mouseY, mouseY, mouseY,mouseX);
    fill(#9B1362);
   ellipse(mouseY, mouseY, mouseY,mouseY);
    fill(#FF4E08);
   ellipse(mouseX, mouseY, mouseX,mouseX);

 }

Hover your mouse over the window below to give it a try !

Link to Sketch :
https://www.openprocessing.org/sketch/383091