var rgb = new Uint8Array(25*3);

var pos=0;
function getPattern() {
  pos++;
  for (var i=0;i<rgb.length;i+=3) {
     rgb[i  ] = (1 + Math.sin((i+pos)*0.1324)) * 127;
     rgb[i+1] = (1 + Math.sin((i+pos)*0.1654)) * 127;
     rgb[i+2] = (1 + Math.sin((i+pos)*0.1)) * 127;
  }
}

for (var i=0;i<100;i++) getPattern();