It is a new year holidays and I want to draw some bricks

Bricks

Let's define a small palette:

var brickColors = [
  0xFF5D12, // light
  0xAC3232, // dark
  0x7B3232, // main
  0xA37272 // concrete  
]; brickColors.forEach((color, x) => point(x, 0, color));

Just draw some bricks. Each row is moved by 1\3 of a brick size

var brick = {width: 18, height: 10};

var fillBrick = function(x, y, w, h){
    rect(x, y, w, h, brickColors[1]);
}

var drawBrick = function(x, y, w, h){
    rect(x, y, w, h, brickColors[3]);
    
    line(x+1, y+1, x+1, y+h-1, brickColors[2]);
    line(x+1, y+h-1, x+w-1, y+h-1, brickColors[2]);

    line(x+2, y+1, x+w-2, y+1, brickColors[0]);
    line(x+w-1, y+1, x+w-1, y+h-2, brickColors[0]);
    fillBrick(x+2, y+2, w-3, h-3);		
}

update = function() {
    for( var y = 0; y < h; y += brick.height ) {
        for( var x = -y / brick.height * brick.width / 3 | 0; x < w; x += brick.width ) {
            drawBrick( x, y, brick.width, brick.height );
        }
    }
    stop();
}

Add some dithering dirt from the bottom

var fillBrick = function(x, y, w, h){
    rect(x, y, w, h, function(x, y){
        return dither(y/h, brickColors[2], brickColors[1])
    });
}

And a bit of grain from the top side

var fillBrick = function(x, y, w, h){
    rect(x, y, w, h, function(x, y){
        return dither((1-y/h)*2, 0, 1) === 0 ?
            dither(1-y/h*6, brickColors[0], brickColors[1]) :
            brickColors[2];
    });
}

Try using darker concrete mixture

brickColors[3] = 0x2E2922