Processing sketch for generating grayscale, interlocking circles suitable for a desktop background.

circles.pde

// Pressing Control-R will render this sketch.

int x = 50; 
int y = 50; 


void setup() {  // this is run once.   
    
    // set the background color
    background(255);
    
    // canvas size (Integers only, please.)
    size(2048, 1536); 
      
    // smooth edges
    smooth();
    
    // limit the number of frames per second
    frameRate(30);
    
    // set the width of the line. 
    strokeWeight(2);
} 

void draw() {  // this is run repeatedly.  

    // set the color
    stroke(0, 0, 0, random(100));
    fill(random(255), random(100));
        
    // draw a circle
    ellipse(x, y, 100, 100);
    
    // move over a pixel
    if (x < (width - 50)) {
        x += 50;
    } else {
        x = 0;
        y += 50; 
    }
    
    if (y >= (height - 50)) {
        y = 50;
    }
}