For this weeks composition I created a subtle yellow gradient out of circles and arcs, I put the same sketch on a grey background to show the variations of color.

size (600, 600);
background( 255, 255, 0);

fill (255, 255, 140);

noStroke();
ellipse (0,100, 100,100);
ellipse (100, 200, 100, 100);
ellipse ( 2, 300, 100, 100);
ellipse ( 100, 400, 100, 100);
ellipse ( 3, 500, 100, 100);

fill (255,255,160);

ellipse ( 200, 500, 100, 100);
ellipse ( 200, 300, 100, 100);
ellipse ( 200, 100, 100, 100);

fill ( 255,255, 170);
ellipse( 300, 200, 100, 100);
ellipse (300,400, 100, 100);

ellipse ( 400, 100, 100, 100);
ellipse (400, 300, 100, 100);
ellipse (400, 500, 100, 100);

fill (255,255,140);

ellipse (500,200,100, 100);
ellipse (500, 400, 100, 100);

ellipse (600, 100, 100, 100);
ellipse (600,300, 100,100);
ellipse (600,500,100,100);

fill ( 255, 255,190 );
arc (200,500, 100, 100, 0, PI / 2.0);
arc (200, 300,100,100,0, PI/ 2.0);
arc (200,100,100,100,0, PI/ 2.0);

arc ( 300, 200, 100, 100, 0, PI/ 2.0);
arc ( 300, 400, 100, 100, 0, PI/ 2.0);
fill (255,255,0);

arc ( 500,200, 100, 100,0, PI/ 2.0);
arc ( 500, 400, 100, 100, 0, PI/ 2.0);