backgroundImage

var pageSettings = {
  red:200,
  green:200,
  blue:200,
  background: ['https://pictures.s3.yandex.net/background.jpg','https://pictures.s3.yandex.net/cover-color.jpg','https://pictures.s3.yandex.net/cover-grid.jpg','https://pictures.s3.yandex.net/cover-typo.jpg','https://pictures.s3.yandex.net/cover-wall.jpg']

}

var bgColor = 'rgb('+ pageSettings.red+', '+ pageSettings.green+', '+pageSettings.blue+')';
document.body.style.backgroundColor = bgColor;
var header = document.getElementById('main-header');
console.log(header);
header.style.backgroundImage = pageSettings.background[2]