processing.org code for the cover of http://8tracks.com/danielrt/37

37.pde

int i, j;
int[][] c={ // colors
  {26, 56, 56},
  {254, 190, 88}
};
PGraphics n37; // raster "37."
int gray; // color of current pixel
PFont fnt=createFont("HelveticaNeueLTStd-Blk", 54);

void setup() {
  n37=createGraphics(90, 90); // raster "37."
  n37.beginDraw();
  n37.background(0);
  n37.fill(255);
  n37.textFont(fnt);
  n37.textAlign(CENTER, TOP);
  n37.text("37.", 45, 26);
  n37.endDraw();
  size(1440, 1440);
  noStroke();
  background(192);
  for (i=0; i<90; i++) { // one gradient
    for (j=0; j<90; j++) {
      gray=round(red(n37.pixels[i+j*n37.width])/16);
      fill(
        (c[1][0]-c[0][0])/180*i+(c[1][0]-c[0][0])/180*j,
        (c[1][1]-c[0][1])/180*i+(c[1][1]-c[0][1])/180*j,
        (c[1][2]-c[0][2])/180*i+(c[1][2]-c[0][2])/180*j
      );
      quad(
        i*16+(j%2)*16,
        j*16+(i%2)*16,
        i*16+(j%2)*16,
        j*16+16-(i%2)*16,
        i*16+16-(j%2)*16,
        j*16+gray-(i%2)*16,
        i*16+16-(j%2)*16,
        j*16+16-(i%2)*16
      );
    }
  }
  
  // uncomment the next line to save
  // save("portada_37.png");
}