This sketch is created with an older version of Processing,
and doesn't work on browsers anymore.
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int a=10;
int b=10;
void setup () {
size (800,600);
background (50,128,50);
}
void draw() {
strokeWeight (random (1,10));
for (int a=10; a<=800;a=a+20){
fill (random (a,20), random (b,250), random (20,100));
for (int b=10; b<=800;b=b+20){
ellipse (a,b,10,10);
rect (a, b, 30,30);
ellipse (a, b, 30,30);
}
}
}