This reminds me of an album cover from the seventies. My favorite parts about it are the dots down the center and the muted tones. It just wouldn't be the same if all the lines were allowed to have 100% opacity.
fullscreen void setup(){
size(800,800);
smooth();
background(0);
strokeWeight(5);
}
void draw(){
cursor(CROSS);
float y1 = random(0,700);
float y2 = random(100,height);
stroke(random(0,255),random(0,255),random(0,255),10);
line(width,700,width/2,y1);
line(0,700,width/2,y1);
line(width,100,width/2,y2);
line(0,100,width/2,y2);
}
void mousePressed(){
background(random(0,255),random(0,255),random(0,255),20);
}